2011年考博英語聽力重點難點詞組和慣用語(4)

　　pay off

　　rack one’s brains

　　rain cats and dogs

　　roll up one’s sleeves

　　room and board

　　room to let

　　round the clock

　　round the corner

　　so what

　　rush hour

　　second thoughts

　　show one’s cards

　　sleep like a log (top)

　　slip one’s mind

　　speak evil of sb。

　　stand on one’s own feet

　　stay up late

　　talk back/ answer back

　　That’s really tough。

　　the reverse is also true/vice versa

　　think twice (before you leap)

　　under the weather

　　walls have ears

　　want ad

　　Wear (with) a long face

　　What’s the point？

　　white elephant