a blue moon 千載難逢的事
Once in a blue moon, her husband brings her gift.
她丈夫居然送她了一份禮物，真是千載難逢的一件事。
kill time 消磨時光
He had nothing in particular to do, so he went for a walk downtown to kill time.
他沒有什么特別的事要做，所以他為了消磨時間，去市區(qū)散了散步。
call it a day 收工
Why don't we call it a day? I'm really tired.
我們?yōu)槭裁床皇展つ?？我真的很累了?/p>
against the clock 和時間賽跑
The students were racing against the clock to finish the paper before the deadline.
學(xué)生們要趕在時間截止之前努力答完試卷。
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