Monohalogenation
一卤化作用
🗣️ 情景例句
You helped save our company a lot of money.
你帮我们公司节约了许多钱。
What kind of work do you do? Are you a salesman?
你做什么样的工作？ 你是一售货员吗？
I don't know.I've already had my holiday this year.
我不知道。今年我已度过假了。