42. piece of cake 非常容易的事情

The exam was a piece of cake.
考試很簡單。

43. hit the nail on the head 說中要害，說到點子上

I think Mick hit the nail on the head when he said that what's lacking from this company is a feeling of confidence.
米克說這家公司缺乏的是一種自信，我認為他說到點子上了。

44. cost an arm and a leg 花了一大筆錢

These shoes cost me an arm and a leg.
這雙鞋花了我一大筆錢。

45. hit the books 學習；做功課

I can't go out tonight. I've got to hit the books.
我今晚不能出門，我得做功課。

46. bite off more than you can chew 承擔力所不及的事；不自量力

Clinton conceded, "We bit off more than we could chew in our original health care reform proposals."
克林頓承認，“我們最初的醫療改革計劃超出了我們的能力。”

47. when pigs fly 永無可能；決不可能

- Aren’t you going to buy that house?
- 你不打算買那套房了嗎？
- I will when pigs fly. It’s just so expensive, I don’t think it’ll happen.
- 除非豬會飛吧。太貴了，我是肯定買不起了。

48. judge a book by its cover 以貌取人

- I don’t like our new neighbours very much, they’re quite strange.
- 我不喜歡咱們的新鄰居，他們看起來怪怪的。
- You shouldn’t judge a book by its cover. I think they’re just a bit quirky but really nice!
- 不要以貌取人哦。我覺得他們雖然看起來有點怪，但性格很好。

49. miss the boat （因行動慢而）錯過機會，坐失良機

There were tickets available last week, but he missed the boat by waiting till today to try to buy some.
上周還有些票，但他一直等到今天才想去買，錯過了機會。

50. go the extra mile 付出比別人期望中還要大的努力

He's a nice guy, always ready to go the extra mile for his friends.
他是個好人，幫助朋友從來不怕麻煩。

再附贈一個：

51. shape up or ship out 行就行，不行滾（不改進就解雇你）

This is the last time I’m telling you to arrive on time. Shape up or ship out.
這是我最后一次跟你說：別再遲到了。你要是再遲到就卷鋪蓋走人吧。

（中國日報網英語點津 杜娟）