鑽牛角尖 [ㄗㄨㄢ ㄋㄧㄡˊ ㄐㄧㄠˇ ㄐㄧㄢ; zuan1 niu2 jiao3 jian1]
lit. to penetrate into a bull's horn (idiom); fig. to waste time on an insoluble or insignificant problem
to bash one's head against a brick wall
a wild goose chase
a blind alley
to split hairs
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