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
You're going to have the time of your lives.
你们将会玩得非常痛快。
You're not yourself today.
你今天不太对劲。
How long has this factory been open?
这家工厂建成有多久了？