Hydroxylapatite
(=hydroxyapatite)羟磷灰石
🗣️ 情景例句
I always go back to the city in a wonderful state of mind.
我再回到城里时， 精神总是十分饱满。
I hope you bring his quitar with him.
我希望你带他的吉他一起来。
'Good heavens!' exclaimed his wife.
“天啊！”他的夫人惊叫，