zuān niú jiǎo jiān
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
zuān niú jiǎo
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
niú jiǎo jiāo
Cayenne pepper
red pepper
chili
niú jiǎo guà shū
lit. to hang one's books on cow horns (idiom)
fig. to be diligent in one's studies
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