Pfcs
abbr. 全氟化碳；全氟代烃类
🗣️ 情景例句
Well, I'm not sure. Ellen.
噢， 我无法肯定， Ellen。
Worry kills more men than work.
忧虑比劳累更伤人。
If they knew how difficult it was to drill through the hard rock, they would lose heart.
如果他们知道了钻透那坚硬的岩石有多么困难，他们会丧失信心的。