Polychlorodifluoroethylene
聚二氟氯乙烯; 聚二氟氯乙烯
??? 情景例句
What was the weather like yesterday?
昨天的天氣怎么樣？
Have you ever thought about a career in the medical profession?
你曾經在醫藥專業考慮職業嗎？
How old are you?
您多大歲數了？