吐故納新 [ㄊㄨˇ ㄍㄨˋ ㄋㄚˋ ㄒㄧㄣ; tu3 gu4 na4 xin1] lit. to breathe out stale air and breathe in fresh (idiom, from Zhuangzi 庄子); fig. to get rid of the old and bring in the new ◄ ►
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