雅思阅读话题词汇51-60

51.drought

phrase for: goal drought;soil drought;drought field;great drought

eg1:They developed strategies for surviving harsh drought periods, decades of heavy or cold; adopted agriculture and stocl-raising, which revolutionised human life; and founded the world's first pre-industrial civilisations in Egypt,Mesopotamia and the American

eg2:The government has pledged two hundred and fifty million dollars to help the drought stricken farmers。

synotonym: aridity;dryness

derive:droughtiness;droughty

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52.emission

phrase for: greenhouse gas emission ;zero-emission cars

eg1:Amost-400mayors have signed an agreement to cut their cities' greenhouse gas emissions.

eg2:Many people buy larger cars than their daily needs or waste enegy by driving aggressively,Besides,global car use it increasing at a faster rate than the improvement in emissions and fuel efficiency.

eg3:The new fuel can save energy and cut carbon dioxide emissions.

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53.emit

eg1:Emission from new cars are far less harmful than they used to be,but city streets and motorways are becoming more crowded than ever, often with older trucks,buses and taxis, which emit excessive levels of smoke and fumes

eg2: It is unlawfu for factories  to emit balck smoke into the air

54.enhance

phrase for: enhance one's reputation; enhance one's confidence; enhacen the ability

eg1:Not only would this save energy and cut carbon dioxide emission, it would also enhance the quality of community life, putting the emphasis on people instead fo cars

eg2:Organisations provide a range of opportunities for women to enhance their skills

55.equation

eg1:Core performance is not a simple or mundane thing of higher,faster,loner,So many varrables enter into the equation,and our understanding in many cases is fundamental

eg2:The researchers thought that people should not leave out of the equation in the rainforest

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56.equator

eg1:We now have hundreds of tree-ring records from throughout the northern hemisphere,and many from south of the equator,too,amplified with a growing body of temperature data from ice cores drilled in Antarctica, Greenland, the Peruvian Andes,and other locations

eg2:The equator divides the earth into two hemispheres

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57.erode

eg:The fertille land of the Nile delta is being eroded at an astounding rate,in some parts estimated at 100 metres per year

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58.erosion

phrase for: soil erosion; coastal erosion 

eg1: International environmental organisations are beginning to pay close attention to the region, partly because of the problems of reosion and pollution ot the Nile delta, but mainly because they fear the impact this situation could have on the whole Mdeiterranean coastal ecosystem

eg2:Often dams are built to protect the area from soil erosion and to serve as permanent sources of water

synonym: corrosion;deterioration

derive: erosional,erosive

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59.eruption

phrase for: gas eruption;area eruption; skin eruption

eg1:Geologist forecasted that an eruption of the volcano would take place before the end of the century

eg2:The volcano erupted in 1980,devastating a large area of Washiington state

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60. excavate

eg1:The team's attempts to extract DNA from the 194 bones all failed. The newly excavated fossils,however, all yielded DNA

eg2;Some large species orginating from France excavate tunnels to a depth of approximately 30cm below the dung pat

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