1．他已绞尽了脑汁。
  He had racked his brain.
rack--使受折磨，使痛苦。也可说wrack your brain(s) 
  2．这几天不知是什么事把我搞得心烦意乱的。
  I don‘t know what has set my nerves on edge these days.
nerves---神经元
  3．我可不愿意白吃白喝别人。
  I wouldn‘t freeload.
freeloader---a person who is always accepting free food and accommodation from other people without giving them anything in exchange寄生虫
  4．他们开车到外面兜风去了。
  They drove the car and went out for a spin.
spin--高速驾驶
  5．你为什么总拿别人开心？
  Why should you always like to rib others? 　
rib--to laugh at sb and make jokes about them, but in a friendly way
  6．新任宣传部经理的确精明干练。
  The new publicity manager is really on the ball.
on the ball----to be aware of and understand what is happening and able to react quickly 敏锐，机警
  7．他对保险业务一窍不通。
  He doesn‘t know beans about insurance business at all.
full of beans ---having a lot of energy精力充沛
not have a bean---to have no money 不名一文
  8．别跟我瞎吹了，我又不是不了解你底细。
  No big talk with me. I have your number.
have(got) sb's number---to know  what sb is really like and what they plan to do
    9．李明是个败家子。
  Li ming is the black sheep of his family.
  10．她是个天生爱哭的人。
  She‘s a natural crier.
  11．他真是个不知羞耻的家伙。
  He‘s really a law-down dirty shame.
  12．他可是个乐天派，整天无忧无虑的。
  He‘s good-time Charlie, feeling no worries and anxieties.
Charlie---有指人笨的意思。。。freeloader
  13．论开车技术，不李和小王那真是不分上下。
  In the skills of driving, Xiao Li and Xiao Wang are neck and neck.
  14．他可是个有头脑的人。
  He‘s a brain.
  15．你刚才提到的那个作家只不过是个有名无实的人。
  The man you‘ve just mentioned is but a poor apology for a writer.
  16．他真的太没骨气了。
  He really has no guts.
guts--the courage and determination that it takes to do sth difficult or unpleasant勇气，胆量
  17．昙花一现
  A flash in the pan
  18．他喜欢单匹马地去干。
  He always likes to play a lone hand.
  19．他一开始就出师不利。
  He got off on the wrong foot when he started doing it.
  20．你还嫩点儿。
  You‘re still wet behind the ears.
  21．她的饭量特别小。
  She eats like a bird.
  22．那个孩子的嘴特别硬。
  That boy never says uncle.
Bob's your uncle--易如反掌
  23．我们队占上风。
  Our team gained the upper hand.
  24．你中圈套了。
  You rose to the bait.
bait---诱饵
  25．见机行事
  Play to the score.
  26．肯定有人唆使他去干那件事。
  There must be someone who had put him up to that.(正式：唆使＝instigate)
  27．他不是不愿意帮助你，而是他心有余而力不足。
  It‘s not that he doesn‘t like to help, but that the spirit is willing,
  but the flesh is week.
spirit,flesh--精神，肉体
  28．事到如今，我们也只好听其自然了。
  With things as such, we‘ll have to let things slide.
  29．这场旱灾是百年不遇的。
  This draught occurs once in a blue moon.
  30．算了吧。
  Iet‘s call it quits.
  31．她的嘴很紧。
  She‘s tight-mouthed.
  32．玲玲是她爷爷的掌上明珠。
  LIng Ling is the apple of her grandpa‘s eye.
  33．从人口数量方面讲，印度仅次于中国。
  Talking about the size of population, India is next only to China.
  34．我不知道。那只是我瞎猜的。
  I didn‘t know. I was only a shot in the dark.