Polyfluoroprene
聚氟丁二烯
🗣️ 情景例句
I've been moonlighting for years.
我几年来一直兼职。
Your friend was here a week ago,wasn't he?
一个星期前，你的朋友曾在这里，是不是？
I hope you have a good journey back to Guangzhou.
祝你回广州时一路顺风。