Question

一回生， 二回熟一回生， 二回熟[yī huí shēng èr huí shú]1.■ （指人） First meeting, strangers; second meeting, old friends.; Strangers the first time, friends the second.; The first time strangers, the second time acquaintances.

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常用词组1.■ （指做事情） awkward at first, but easy afterwards; difficult at first but easy later on