Sourcebook
n. 原始资料(集),资料读物
🗣️ 情景例句
I think we're having communication problems again.
我想我们又遇到语言沟通的问题了。
That's great!
真棒！
Imagine a pen attached to the weight in such a way that its point rests upon a piece of paper on the floor.
假定把一支笔拴在重物上，笔尖落在地板上的一张纸上，