1.rack one's brains 绞尽脑汁，苦苦动脑筋

例句：The gap in wealth comparison Privation has arrived at a pole , has been that every day, you being every pair of meal but rack one's brains.

贫富差距的比较贫穷到了极点，就是每一天你在为每一对饭而绞尽脑汁；

2.rain check (棒球等露天赛事）因下雨改期。再赛时作为入场券的原票票根,(邀请方在受邀方一时不能应邀时的)下次再邀的表示,邀请继续有效的保证，受邀方一时不能应邀时的）请对方下次再邀的要求，(商店在廉价商品售罄时对顾客的)下次优先供货保证。

例句：I'm not available now. Can I have a rain check?

我现在没空，可以改天吗？

3.rain down 雨点般降下，倾泻

例句：All kinds of gifts were rained down upon the children.

各式各样的礼品纷纷送到孩子们手里。

4.rain or shine 不论晴雨，无论情况如何

例句：Rain or shine, the match will go on time.

不管晴天还是下雨，比赛准时进行。

5.rain out 使(雨）下完(停止)；[常用被动语态]因雨阻止，因雨中断（延期、取消）

例句：The athletic meeting was rained out.

运动会因雨延期举行。

6.rake over the ashes 回忆（不偷快的）往事；旧事重提

例句：I don't want to get into a discussion with Arnold because he'll want to rake over the ashes of my past mistakes.

我不想和阿诺德讨论，因为他想使我回想起我过去犯错误不愉快的往事。