Osteogenin
成骨素
🗣️ 情景例句
Sure, anything you say.
当然，你说什么就是什么。
I am sorry to keep you waiting.
真抱歉，让你久等了。
But I couldn't answer the rest.They were too difficult for me.
但我回答不出其作的题。那些题对我来说太难了。