Corundume
氧化鋁
??? 情景例句
When is the wedding?
什么時(shí)候舉行婚禮呢？
I want to be a journalist after graduation.
畢業(yè)后我想當(dāng)記者。
Kunta wondered why the white people had done this to him.
孔塔不知道白人為什么要這樣對(duì)待他。