Know one's business
精通自己一行
🧩 词语组成解析
know
[no]
v. 知道;了解;认识;确信;
n. 知情;
a. 人们的；自己的
business
[ˈbɪznɪs]
n. 商业，交易;生意;事务，业务;职业，行业;
🗣️ 情景例句
It just depends on a number of things.
这得靠许多因素才能决定。
To be of use in the world is the only way to be happy.
为善最乐。
To get a full appreciation of what this means we must turn first to some recent human inventions.
要透彻理解这句话的意义，我们应先回顾一下人类最近的几项发明。