laugh up one s sleeve 偷偷的笑话某人 例句：We were all laughing up our sleeves at the teacher when he was up at the blackboard explaining the math problem. He had a rip in the back of his pants and didn t know it. 当老师在黑板前讲解数学题的时候，我们都偷偷地笑，因为他裤子后面有个裂缝，他自己还不知道。 a red letter day 大喜的日子 例句：It was a real red letter day for me when my son came home from three years in the navy. We rolled out the red carpet to welcome him home. 我儿子在海军里服役了三年。他回家的那天对我来说真是一个大喜日子。我们真是把他当贵宾一样来欢迎他。 red tape 官僚主义，文牍主义 例句：With all the red tape I ran into at city hall, it took me three months to get my business license. 我在市政厅遇到了各种官僚主义的麻烦。我化了整整三个月才拿到营业执照。 rain check 给第二次机会 例句：I d love to go out with you, Ben. I m sorry I m busy tonight, but I d like a rain check. 本，我很愿意和你出去玩。但是，非常抱歉的是我今晚很忙。我们下回去玩好吗？ it never rains but it pours 祸不单行 例句： Oh boy! You can t believe the trouble I had today. My alarm clock didn t go off, so I missed biology class. Then, I lost my home work assignment for math. I invited my girlfriend to lunch and after we ate, I found I d left my wallet at home. It never rains but it pours. 咳，你真不会相信今天我有多倒霉。首先，我的闹钟没有响，所以我没有上生物课。然后，我又把我的数学作业给丢了。我请女朋友吃午饭，吃晚饭我才发现我把钱包忘在家里了。呵，这可真是祸不单行呐。 更多信息请关注100Test外语站点。