Know one's stuff
精通自己的业务
🧩 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
stuff
[stʌf]
n. 材料，原料，资料;〈俚〉钱，现金;填充物;素材资料;
vt. 塞满;填塞;让吃饱;
vi. 吃得过多;
🗣️ 情景例句
Open it, please.
请打开看看。
He has never been out of China, so he is very excited about liveing abroad.
他以前从未出过国，因此对出国很兴奋。
He did very badly on the exam----worse than expected almost the worst in the class.
他考的不好，比期望的还糟。几乎是全班最差的。