Osteocalcin
骨钙素；骨钙蛋白
🗣️ 情景例句
That's a practicable course of action.
那是一个切合实际的行动方案。
In case of fire, keep your head.
万一发生火灾，保持镇定。
but unfortunately not all of us are born handymen.
但不幸的是，我们并非人人都是能工巧匠。