Polyfluoride
多氟化物
🗣️ 情景例句
You're just the man I want to see.
你正是我想见的人。
He has a cup.
他有一只杯子。
I'll keep the things on this shelf for you, said the shopkeeper.
“我先把你的东西放在这个货架上，”售货员说。