Osteogenin
成骨素
🗣️ 情景例句
Those are the rules and regulations, and we have to abide by them.
这些就是这儿的规矩， 大家都应该遵守。
To study in school
在学校读书
Imagine an earthquake shock shaking the floor, the paper, you and your hand.
假定地震发生了，地板、纸、你和你的手都会动，