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<br />school board: a board in charge of local public school教育委员会<br /> <br />legislate: make laws,bills,etc. or bring into effect by legislation 制定法律 通过立法<br /> <br />algebra: 代数学<br /> <br />intervention: the act of intervening 干涉<br /> <br />His educati

<br />floodwater: the water of a flood      洪水<br /> <br />sicken: get sick   厌恶<br /> <br />pollutant: waste matter that contaminates the water or air or soil   污染物质<br /> <br />specialist: an expert who is devoted to one occupation or branch of learning 

<br />the Great Depression 经济大萧条（1929-1939）<br /> <br />average: lacking special distinction,rank or status  普通的<br /> <br /> bureau: an administrative unit of government  局，办事处<br /> <br />federal reserve: 美国联邦储备系统<br /> <br />budget: make a budger 做预算<br

<br />emergency: a sudden unforseen crisis that requires a immediate action   紧急事件 突发事件<br /> <br />documentary: 纪录片<br /> <br />humanitarion: 人道主义者（n.） 人道主义的（adj.）<br /> <br />crew: an organized group of workmen一组工作人员<br /> <br />It was pretty much of a s

exclusion: the state of being excluded 排除tumble down: 倒塌，跌倒bar: the act of preventing 禁止       Congress passed the law to bar discrimination against people with phasical or mental disablities.weird: 古怪的，怪异的

intense: 剧烈的，强烈的 in an extremely degree     As the election approaches the war of words between the main political parties becomes increasingly intensein quality 在质量上

undesirable: 不受欢迎的，不良的 Faced two equally undeisrable alternatives.crop: 农作物by comparison : 比较起来，相比之下be buried in: 沉溺于eradicate: 根除，根绝   eradicate weeds除草dense：浓密的  dense frog浓雾shade： （V）遮蔽，使阴暗 shaded by a tree