“A blue moon”真的不是“蓝月亮”吗？

a blue moon 千载难逢的事

Once in a blue moon, her husband brings her gift.

她丈夫居然送她了一份礼物，真是千载难逢的一件事。

kill time 消磨时光

He had nothing in particular to do, so he went for a walk downtown to kill time.

他没有什么特别的事要做，所以他为了消磨时间，去市区散了散步。

call it a day 收工

Why don't we call it a day? I'm really tired.

我们为什么不收工呢？我真的很累了。

against the clock 和时间赛跑

The students were racing against the clock to finish the paper before the deadline.

学生们要赶在时间截止之前努力答完试卷。

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