Fluoropak
聚四氟乙烯载体
🗣️ 情景例句
Do you have any brothers or sisters?
你有兄弟姐妹吗？
She's a widow.Her husband died last year.
她是一个寡妇。她的丈夫去年死了。
They then knew that they had discovered the cause of the fire.
这时调查人员知道他们找到了发生火灾的原因了。