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
Where's the ticket counter?
售票处在哪儿？
Don't keep all your eggs in one basketball.
勿孤注一掷。
Only five years?
仅仅5 年？