Hydroxylapatite
(=hydroxyapatite)羟磷灰石
🗣️ 情景例句
Dad works hard, and he works late.
爸爸工作忙， 而且忙到很晚。
He may get a grant to study abroad next year.
他明年也许会获得留学奖学金。
Oh dear! Where can I go if I want to smoke a cigarette?
天啊！我该到什么地方吸烟呢？