He works best who knows his trade.

trade的用法 ... drive in a roaring trade 生意兴隆 He works best who knows his trade. [谚语]事怕行家。 home trade 国内贸易 ...

... 1638 He works best who knows his trade. 万事怕行家. 1639 Look on the bright side of things. 要看事物的光明面. ...

英文谚语... ... 195. He works best who knows his trade. 内行的人做他 196. Hide nothing from thy physician. 切莫讳疾忌医。 ...