Elements
n. 原理, 基础
✅ 同义词
🗣️ 情景例句
whom I think you've met once or twice before.
我想你以前见过他一两次面。
The speaker kept wandering off.
演讲的那个人老是走题。
You'd better check with the shipper.
你最好向货运公司查查看。