as cool as cucumber镇定，镇定自若as hungry as a lion渴望得到as sharp as a spear聪明睿智。
black is white and white is black黑白颠倒cast-iron nerves坚强的意志as sly as a fox诡计多端。
eat like a bird吃得少，饭量小，胃口小。
as quite as a mouse静若处子，寡言少语，不声不响，非常安静as busy as a bee和蜜蜂一样忙碌a piece of cake小菜一碟。
child's play小孩的把戏，很容易去做。
off the top of one's head未经思考地，脱口而出地on *****理论上。
do one's homework对。了如指掌as easy as pie轻而易举，十分容易as plain as day一清二楚，显而易见。
be raining cats and dogs倾盆大雨，大雨滂沱one's cup of tea喜欢或合乎某人的喜好或口味an arm and a leg昂贵的代价hold firm坚信，坚持。
on its last legs将要崩溃或濒临死亡senior citizens年老的人或老人。
physically challenged身体有残疾的人visually challenged人视力不好。
not all there不太正常，神志不清，呆头呆脑sanitary worker保洁，清洁工。
the man in the street普通工薪阶层的人between jobs失业。
wash one's hands上厕所。
body count在某一现场发现的死亡人数correctional facility监狱。
capital punishment= death penalty死刑negative profits损失。
pre-owned = second-handed/used二手的，旧的person of interest有利害关系的人golden years退休时期。
be economical with the truth有所隐瞒a confidential source提供情报者，线人in black and white报纸黑字。
egghead = a very clever person一个非常聪明的人。
rain or shine = na matter what difficulties we face风雨无阻wet behind the ears = lacking experience缺乏经验call it a day今天到此结束，收工。
bite off more than he could chew - take on more than he could handle
所承担的已超出他的能力范围。
keep one's finger crossed祈求好结果。
couch potato - a person who spends too much time watching tv沙发土豆give sb. a hand = do sb. a f**or帮助某人。
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