Protocalcium
原钙, 初钙
🗣️ 情景例句
The welcome sign over the door.
门上的欢迎标语。
My father refused to consent to my marrying her.
父亲拒绝答应我和她结婚。
It immediately ran away when she saw it, and experts confirmed that a puma will not attack a human being unless it is cornered.
她刚看见它，它就立刻逃走了。专家证实，美洲狮非被逼得走投无路，是决不会伤人的。