Polychlorohydrocarbon
多氯代烃
🗣️ 情景例句
Rome wasn't build in a day.
伟业非一日建成。
He may well be contented who need neither borrow nor flatter.
一个既不用借债又不用奉承人的人，可以称得上心满意足。
How many of you are making the trip?
你们有多少人去旅行？