四级作文常用连接词总结

四级作文常用连接词总结

1、总结关系过渡词语
in general, to some extent, in my view, as for me, as far as I
am concerned, obviously, in brief, on the whole, to sum up, all
in all, in a word, in conclusion
2、比较对比关系过渡词语
similarly, on the contrary, on the one hand, on the other
hand, otherwise, in sharp contrast, but, however, yet,
nevertheless
3、 列举关系过渡词语
1)to begin with, then, furthermore, finally (强烈推荐)
2)to start with, next, in addition, finally (强烈推荐)
3)first and foremost, besides, last but not least (强烈推荐)
4)most important of all, moreover, finally (强烈推荐)
5)on the one hand, on the other hand (适用于两点的情况)
6)for one thing, for another (适用于两点的情况)
4、因果关系过渡词语
because (of), since, for, owing to, thanks to, as a
result of, consequently, for the reason that, therefore,
hence
5、让步关系过渡词语
although, even though, in spite of, despite
6、强调关系过渡词语
surely, obviously, particularly, in deed, needless to
say, most important of all
7、递进关系
in addition, also, moreover, besides , what’s more
四级作文经典句型
1)主语从句
It is common knowledge that honesty is the best policy.
It is well- known that …
It is self- evident/ conceivable / obvious / apparent that …
It goes without saying that …
It is universally acknowledged that …
It is / that
2)宾(表)语从句
We cannot understand why he was so cruel to his
roommates.
The problem is not who will go, but who will stay.
3)定语从句(限定性和非限定性)
As is shown/ demonstrated/ illustrated/ depicted/
described … in the cartoon/ picture/ graph/ table …,
There are many reasons why I want to study in your
university.
It is estimated that tens of billions of pounds spent on
cigarettes every year in our country, which is a huge waste.
4)状语从句(时间,原因,地点,条件,让步,转折 when, since, because,
if, though, before 等)
When the man is enjoying the cigarette, the smoke becomes a
monster (怪物) which will devour him.
Whatever the reason, there are still some problems with student
use of computers.
5)分词短语做定语或状语
Prof. Kang came to our university, giving us a lecture on how to
acquire English better.
6)倒装句 (only, neither, nor, at no time, in no case)
Only through these measures can we hope to solve the problem.
Scattered around the globe are more than 100 small regions of
isolated volcanic activity known to geologists as hot spots.
7)被动句
Some measures should be taken to deal with the problem.
He is said to have accomplished a lot of great deeds.
Many people believe that (…It is believed that …) 8)强调句
It is not who rules us that is important , but how he rules us.
9) 省略句
If so, we have to give it up.
If necessary…
Whatever the reason…
10) What 句型
We totally agree with what you have just said.
11) 设问句
Do you still remember the boy who cried wolf for several
times so no one would trust him?
12) no more …than …
A home without love is no more a home than a body without a soul is a
man.
13) m ay as well …as 与其 …不如
One may as well not know a thing at all as know it imperfectly.
14) the ~est …that I have ever seen ( known/heard/had/read, etc)
Mr. Chang is the kindest teacher that I have ever had.
15) cannot …too…
You cannot be too careful.
16)否定 +until(till)
Nobody knows what he can do till he has tried.
17) Nothing is ~~ er than to
Nothing is more important than to receive education.
18) There is no doubt that ~
There is no doubt that our educational system leaves
something to be desired.
19) So …is …that … (如此 …以致于 …)
So precious is time that we can’t afford to waste it.
20) Adj as …is
Rich as our country is, the qualities of our living are by no
means satisfactory.
21) the mor e…the more …
The harder you work, the more progress you
will make.
22) By doing, we can …
By taking exercise, we can always stay healthy.
23) It is time + 过去式 (该是 …的时候了)
It is time the authorities took proper steps
to solve the traffic problems.
24) Those who …
Those who violate traffic regulations should be
punished.
25) For the past …years , sb + 现在完成式 …
For the past two years, I have been busy
preparing for the examination.
26)Since+S+ 过去式, S+现在完成式。
Since he went to senior high school, he has
worked very hard.
27) It pays to do …(…是值得的。)
It pays to help others.
28) Due to/Owing to/Thanks to … (因为 …)
Thanks to his encouragement, I finally realized my
dream.
29)不定式、动名词作主语
To know something about English is one thing; to know English is
quite another .
30) It is no use doing sth.
It is no use crying over the spoiled milk.
31) “too …to句型”
She is too angry to speak.
32) “so…that …” “… so that句型…”
He ran so fast that nobody could catch him up.
The teacher explains the sentence slowly and clearly so that
everyone can understand.
33) “range from …to …”结构
His hobbies range from painting to playing basketball.
34) attach importance to / lay emphasis on
The government attaches great importance to the protection of the
environment.
35) not … but
Tom was not there but his brother was.
36) there is a chance that …
There is a chance that we can finish the task on time.
37. instead of …+句子
Instead of telling the truth, he lied.
38. it is + a.+ for sb. to do sth.
It is convenient for us to search online.
It is necessary for you to hurry up.
39. when it comes to …+名词 /动名词
When it comes to his achievements in the past, he becomes
really excited.
40. partly because of …and partly because of …
Partly because of his great effort, and partly because of his talent,
he achieved great success.
41. It seems as if …
It seems as if it is going to rain.
42. …也是 / ….也不
You agree with him, so do I.
You don ’t agree with him, nor does he.
43. Only if 只有… …才
Only if you go visiting the mountain by yourself, can you feel the
beauty of it truly.
Only in this way can you learn English well.
44. if only/ as long as 只要 …就
If only you work hard, I believe you can get promoted.
四级作文常用短语

  1. 许多
    可数名词 : a great/good many
    a large number of
    many a + 单数名词
    不可数名词 : a large amount of
    a large sum of
    a great deal of
    两者都可: plenty of
  2. 影响
    have an effect on
    have an influence on
    have an impact on
    play an important role in
    play an important part in
  3. 喜好
    prefer A to B
    prefer to do sth.
    prefer to do rather than do
    would rather do than do
  4. 把 …看作
    regard … as
    view … as
    consider … as
    look on … as
    refer to …as
  5. 区别
    distinguish … from … ;
    separate … from …
    divide … from …
    tell … from …
    6.就我 (们)所知
    As far as we know,
    As is known to all,
    As we all know,
    As far as I ’m concerned
    7.导致
    result in
    result from
    cause
    lead to
  6. 阻止
    prevent sb. from doing sth.
    stop sb. from doing sth.
    inhibit sb. from doing sth.
    discourage sb. from doing sth.
    forbid sb. to do sth.
    9.重要的
    critical, essential, vital, crucial, significant
    It is … to do sth.
  7. 减少
    diminish, decrease, reduce, cut down
    cut back on, decline, eliminate
  8. 尽管
    despite that,
    in spite of,
    although,
    though
  9. 作用
    contribute to
    affect
    play a part in
  10. 关于,鉴于,由于
    with regard to
    in view of
    with a view to
    concerning
    considering
  11. 以免、唯恐
    lest
    for fear that +虚拟语气
    in case that
    in case of + 名词短语
  12. 对比
    in contrast, by contrast,
    in contrast with, by contrast with
    in comparison, by comparison
    in comparison with
    conversely
    compared to
  13. 决定
    be determined to do
    choose to do
  14. 经常
    all too often
    more often
    frequently

  15. outstanding
    marvelous
    terrific
    splendid
    excellent
    distinctive
    distinguished
  16. 易于、倾向于
    be liable to
    be inclined to
    tend to
    be likely to
  17. 努力
    make an effort to
    struggle to do sth.
    do one ’ s utmost to do sth.
  18. 一系列
    a series of
    a range of
    a string of
  19. 毫无疑问,众所周知
    undoubtedly
    There is no doubt that
    without doubt
    No one can deny that
    It is commonly acknowledged that
    It goes without saying that
    It is generally/ widely believed/ held/ agreed that
  20. 事实上
    in fact
    actually
    as a matter of fact
    practically
    virtually
    24 为了
    for the sake of
    on behalf of
  21. 有时
    sometimes
    at times
    from time to time
    on occasion
    now and then
    now and again
  22. 越来越:
    be increasingly + adj.,
    be on the rise,
    the growing number of
    more and more
  23. 归因于;归咎于
    attribute … to
    owe… to
    be to blame/ blame sth. on sb.
    万能理由( Omnipotence )
  24. 方便: convenient/ convenience
  25. 效率: efficient/ efficiently/ efficiency
  26. 节省和浪费:save time/ money/ space; economical, thrift,
    waste time/ money/ space; costly, lavish
  27. 人的心理健康: independent, cooperative, competitive,
    considerate, confident, creative, sociable, perseverance;
    selfish, isolated, conservative
  28. 人的身体健康: health, disease, strong, strength, energetic
  29. 娱乐: colorful, pleasure, joy, recreation, entertainment, relax,
    tired, boring, lonely
  30. 环境: environment, pollute, poisonous, dirty
  31. 安全和危险: safe, danger, risk
  32. 经验: experience, social experience, enter the society
  33. 人际: humane, fair, unfair, help, assist, freedom, freely
【电力系统】单机无穷大电力系统短路故障暂态稳定Simulink仿真(带说明文档)内容概要:本文档围绕“单机无穷大电力系统短路故障暂态稳定Simulink仿真”展开,提供了完整的仿真模型与说明文档,重点研究电力系统在发生短路故障后的暂态稳定性问题。通过Simulink搭建单机无穷大系统模型,模拟不同类型的短路故障(如三相短路),分析系统在故障期间及切除后的动态响应,包括发电机转子角度、转速、电压和功率等关键参数的变化,进而评估系统的暂态稳定能力。该仿真有助于理解电力系统稳定性机理,掌握暂态过程分析方法。; 适合人群:电气工程及相关专业的本科生、研究生,以及从事电力系统分析、运行与控制工作的科研人员和工程师。; 使用场景及目标:①学习电力系统暂态稳定的基本概念与分析方法;②掌握利用Simulink进行电力系统建模与仿真的技能;③研究短路故障对系统稳定性的影响及提高稳定性的措施(如故障清除时间优化);④辅助课程设计、毕业设计或科研项目中的系统仿真验证。; 阅读建议:建议结合电力系统稳定性理论知识进行学习,先理解仿真模型各模块的功能与参数设置,再运行仿真并仔细分析输出结果,尝试改变故障类型或系统参数以观察其对稳定性的影响,从而深化对暂态稳定问题的理解。
本研究聚焦于运用MATLAB平台,将支持向量机(SVM)应用于数据预测任务,并引入粒子群优化(PSO)算法对模型的关键参数进行自动调优。该研究属于机器学习领域的典型实践,其核心在于利用SVM构建分类模型,同时借助PSO的全局搜索能力,高效确定SVM的最优超参数配置,从而显著增强模型的整体预测效能。 支持向量机作为一种经典的监督学习方法,其基本原理是通过在高维特征空间中构造一个具有最大间隔的决策边界,以实现对样本数据的分类或回归分析。该算法擅长处理小规模样本集、非线性关系以及高维度特征识别问题,其有效性源于通过核函数将原始数据映射至更高维的空间,使得原本复杂的分类问题变得线性可分。 粒子群优化算法是一种模拟鸟群社会行为的群体智能优化技术。在该算法框架下,每个潜在解被视作一个“粒子”,粒子群在解空间中协同搜索,通过不断迭代更新自身速度与位置,并参考个体历史最优解和群体全局最优解的信息,逐步逼近问题的最优解。在本应用中,PSO被专门用于搜寻SVM中影响模型性能的两个关键参数——正则化参数C与核函数参数γ的最优组合。 项目所提供的实现代码涵盖了从数据加载、预处理(如标准化处理)、基础SVM模型构建到PSO优化流程的完整步骤。优化过程会针对不同的核函数(例如线性核、多项式核及径向基函数核等)进行参数寻优,并系统评估优化前后模型性能的差异。性能对比通常基于准确率、精确率、召回率及F1分数等多项分类指标展开,从而定量验证PSO算法在提升SVM模型分类能力方面的实际效果。 本研究通过一个具体的MATLAB实现案例,旨在演示如何将全局优化算法与机器学习模型相结合,以解决模型参数选择这一关键问题。通过此实践,研究者不仅能够深入理解SVM的工作原理,还能掌握利用智能优化技术提升模型泛化性能的有效方法,这对于机器学习在实际问题中的应用具有重要的参考价值。 资源来源于网络分享,仅用于学习交流使用,请勿用于商业,如有侵权请联系我删除!
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