Chemene
季铵化合物
🗣️ 情景例句
Thanks a lot. Bye.
多谢，再见。
He that liveth wickedly can hardly die honestly.
生而缺德，死必寡诚。
But of course, he can learn by himself. He has a book and a dictionary.
但当然，他也可以自学。他有书和词典。