Quaternarization
[化] 季铵化作用; 门秀金反应
🗣️ 情景例句
Would you like to sign the contract now?
你现在要签这合同吗？
If she could help you, she would help you.
如果她能帮你的话，她会帮你的。
You can't buy them in the shop before eight o'clock.
上午八点之前你在商店里是买不到东西的。