Protocalcium
原钙, 初钙
🗣️ 情景例句
Didn't we go to school together?
我们以前在一起上过学吗？
We should let him face the music.
我们应该让他对自己所做的事负责任。
Certainly, doctor.Come upstairs.
当然可以，医生。上楼吧。