中文拼音： zuan1 niu2 jiao3

中文繁体： 鑽牛角

英文翻译： 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 idiom 鑽牛角尖|钻牛角尖