Adatom
n. [化]吸附原子
🗣️ 情景例句
What's the nature of the problem?
是什么样的问题？
How have you been?
你过的还好吗？
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，