Dddc
[医][=diethylammonium diethyl dithio carbamate]二乙基二硫代氨基甲酸二乙基铵
🗣️ 情景例句
You never looked better.
再漂亮不过了。
May I use your typewiter?
我能用你的打字机吗？
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，