Perfluoroethylene
[机] 四氟乙烯
🗣️ 情景例句
Let's give him our presents--now.
现在把我们的礼物送给爷爷吧。
No. We're supposed to go to the movies.
不，我们决定去看电影了。
Our next obstacle was a shallow pool of water about half a mile across.
下一个障碍是一片约半英里宽的浅水塘。