Treatment methods in which the application of physical forces predominate are known as physical unit operations. Examples of physical unit operations include screening, mixing, sedimentation, gas transfer, filtration, and adsorption. Treatment methods in which the removal or conversion of constituents is brought about by the addition

Part I Wastewater Engineering 1 Wastewater Engineering: An Overview Fig. 1-1 Schematic diagram of a wastewater management infrastructure

Five Famous Symbols of American Culture The Statue of Liberty In the mid-1870s, French artist Frederic Auguste Bartholdi was working on an enormous project called Liberty Enlightening the World, a monument celebrating US independence and the France-America alliance. At the same time, he was in love with a woman whom he had met in Canada. His mother could not approve of her son’s affection for a woman she had never met

1. frustrate [ frQs5treit ] 1)阻止(某人)做某 事；破坏(to prevent from achieving an objective) 2) 使沮丧(to cause feelings of discouragement ) The weather frustrated our plans. 天气破坏了我们的计划。 two hour's frustrating delay

1. toil [ tCil ]苦干, 跋涉, 费力地做 (to do work that requires a lot of effort) [搭配用法] toil over (task, manuscript, corrections) = work hard and continuously at sth 例 toiling over the mountains. 艰难地跋涉于山岭之间

w•1. defraud [ di5frC:d ]欺骗(to take something from by fraud; swindle; deceit) w•be defrauded of (one's estate) w被骗去(财产)

1. abandon [ E5bAndEn ] 1)放弃, 遗弃(to give up completely)2)n.放任, 狂热 [搭配用法](writer, artist)abandon oneself to (grief, despair)=give way to ◼ He abandoned his wife and went away with all their money

addict [ E5dikt ]vt.使沉溺, 使上瘾(to devote or surrender oneself to something) [搭配用法] addict to (smoking, alcohol, television) =devoted to sth.;having (sth.) as a strong, almost unbreakable habit compromise[ 5kCmprEmaiz ] 1.v.妥协, 折衷(to settle by concession) 2. 使遭受损害，使蒙受耻 辱(to put sb. In a position of harm or difficulty)

I. 词义随着时间的变迁，产生了变化，出现了 一词多义的现象。词义的变化主要有两种方式。 若干个不同的新义，从同一个原义引申出来， 叫做radiation, “反射式变化”；例如head, 从 “头部”的原义，引申为“首脑

1. re- : 重、再return, retreat, recall, regress 2. tri-: 三 tricycle, tricar, triweekly 3. multi-: 多 multiparty, multinational 4. dis-: 除去 disarm, disroot, discourage