Polyfluoroethylene
聚氟乙烯
🗣️ 情景例句
The Post Office aims to improve its quality of service.
邮局锐意改善服务质量。
Love asks faith, and faith asks firmness.
爱情要求忠诚，而忠诚要求坚贞。
What's the matter, children?
怎么啦，孩子们？