[钻牛角尖 / 鑽牛角尖, zuān niú jiǎo jiānㄗㄨㄢ ㄋㄧㄡˊ ㄐㄧㄠˇ ㄐㄧㄢ] lit. to hone a bull's horn (成语 saw); 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#40406
[钻牛角 / 鑽牛角, zuān niú jiǎoㄗㄨㄢ ㄋㄧㄡˊ ㄐㄧㄠˇ] lit. honing a bull's horn; 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; same as 成语 saw 鑽牛角尖|钻牛角尖, See Also: 成语, 鑽牛角尖, 钻牛角尖