Fluroplast-4
[化] 氟塑料-4(聚四氟乙烯)
🗣️ 情景例句
We were all sorry when we heard that your brother had had an accident.
我对你弟弟的意外感到遗憾。
Which is the right size?
哪个尺码是对的？
I can't decide!
我拿不准！