Diacetyltannic acid
[医] [二]乙酰鞣酸
🧩 词语组成解析
🗣️ 情景例句
It's about my grandfather.
是关于我爷爷。
Thank you! Same to you.
谢谢。你也一样。
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，