Amargosite
膨土岩
🗣️ 情景例句
Did you know
你知道
There was a big choice of shops in the small town.
这个小镇上有好多商店可供选择。
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，