Polyfluorocarbon
[化] 多氟烃; 多氟代烃
🗣️ 情景例句
She was still beautiful at the age of forty.
她活到四十岁仍然很美。
It would help if you could try to speak a little slower.
请你尽量放慢说话速度。
The police were called in, but they could not arrest anyone,
警察被召来了，但他们却不能逮捕任何人，