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.

學生們要趕在時間截止之前努力答完試卷。

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