Corundume
氧化铝
🗣️ 情景例句
I really must be going now.
现在我真的该告辞了。
How long are you going to stay here?
你要在这里停留多久？
It's to the north of England; it's part of Britain.
它位于苏格兰的北部，是不列颠的一部分。