牛毛

ox hair (used as a metaphor for sth very numerous or sth fine and delicate)

ox / cow / bull / CL:條|条[tiao2],頭|头[tou2] / newton (abbr. for 牛頓|牛顿[niu2 dun4]) / (slang) awesome

surname Mao

hair / feather / down / wool / mildew / mold / coarse or semifinished / young / raw / careless / unthinking / nervous / scared / (of currency) to devalue or depreciate / classifier for Chinese fractional monetary unit ( = 角[jiao3] , = one-tenth of a yuan or 10 fen 分[fen1])

as numerous as the hairs of an ox (idiom) / innumerable / countless