Pentafluoride
五氟化物
🗣️ 情景例句
All we have to do now is shake hands.
现在我们所该做的只是握手了。
Doctors and lawyers are professional people.
医生和律师是专业人员。
the varieties are infinite; but two classes may be roughly seen.
鸟的飞行方式千差万别，但大体上可分为两类。