Polyhalogenation
多卤化反应
🗣️ 情景例句
My mother is a housewife and my father is retired.
我妈妈是家庭妇女，我爸爸退休了。
I bought the car on Paul's recommendation.
根据保罗的推荐我买了这辆车。
For a beginner, you're pretty good.
做为一个初学者，你已经做得很好了。