Fluoberyllate
氟铍酸盐
🗣️ 情景例句
Right.
对。
You really did it this time!
这下你可糟了！
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，