Polyfluoroethylene
聚氟乙烯
🗣️ 情景例句
He is still unable to express himself in English.
他仍然不能用英语表达自己的意思。
The best fish swim near the bottom.
好鱼游水底。
People are always talking about 'the problem of youth'.
人们总是在谈论“青年问题”。