1. a penny for your thoughts

(catchphrase) used to ask sb what he is thinking about.
（警语）用以问某人在想什麽。

据说当时有这种说法的时候，1便士在英国可是很值钱的哦。所以想知道别人在想什么，就得付出点代价。

请看例句：

A: A penny for your thoughts.
A：想什么呢？
B: Oh, I was just thinking about how to tell him I'm leaving.
B：哦，我在想怎么跟他说我要走了。

2. burn the candle at both ends

exhaust oneself by trying to do too many things.
由於超负荷地工作而耗尽精力；操劳过度。

把蜡烛两头烧，没多久就会烧完的。所以累了就该多多休息。

请看例句：

1. She'd been burning the candle at both ends studying for her exams and made herself ill.
她为了准备考试一直太劳累了，结果病倒了。

2. Don't burn the candle at both ends!
别太劳累了！

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