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1·Don't burn the candle at both ends.

不要过分消耗精力。

2·You can't burn the candle at both ends.

蜡烛不能两头点。

3·You cannot burn the candle at both ends.

蜡烛不能两头点，一精一力不可过分耗。

4·You cannot burn the candle at both ends.

蜡烛不能两头点。

5·I can't burn the candle at both ends forever.

蜡烛不能两头点。不要过分耗费精力。