Osteogenin
成骨素
🗣️ 情景例句
My dad's letting me borrow the car.
我爸爸借我用汽车。
Who is the chief of sate of this nation?
谁是这国家的领袖？
That's a good question, smiled Uncle Wang.
“这个问题提得好，”王大叔笑了。