Perfluorocarbon
全氟化碳
🗣️ 情景例句
Well, before I go to college,
嗯，在我进大学之前，
I think gray hair makes you look rather distinguished.
我觉得你灰白的头发使你看上去很严肃。
I left at 6:00 so that I could catch the train.
我六点钟出门，以便赶上火车。