Polyfluoride
多氟化物
🗣️ 情景例句
Ellen, I'd like your opinion. Ellen
我想听听你的意见。
It is not good to make a sleeping lion.
弄醒睡狮不是好事。
She explained that Rastus was very dear to her.
拉姆齐太太解释说她心疼她的猫拉斯特斯。