不知不觉
phrase C2- (idiom) unconsciously; unwittingly
From the library
不知不觉，这「老残」二字便成了个别号了。
一面吃酒，一面谈心，不知不觉，那东方已渐渐发大光明了。
」信步走来，不知不觉已到高升店口。
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