Serotaxonomy
n. 血清分类学
🗣️ 情景例句
Is something bothering you?
有什么事烦你吗？
How many gallons are you going to take?
你要拿几加仑？
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，