Polyfluoride
多氟化物
🗣️ 情景例句
You really ought to take some time off.
的确应该休一休假。
I'm no match for him.
我根本不是他的对手。
3 What have you been interested in for as long as you can remember?
3。你所能想起来的自己感兴趣的事是什么？