Osteocalcin
骨钙素；骨钙蛋白
🗣️ 情景例句
What's that?
什么问题？
Do you ever do exercises on Saturday?
你曾经在星期六做练习吗？
It was carrying some large bags of rice. Suddenly one of the bags fell off the truck.
它运载着大包大包的米。突然一袋米从卡车上掉了下来。