Tricalcium
三钙
🗣️ 情景例句
you used to be in the construction business.
你过去在建筑界工作。
I will take a bus.
我将去搭公共汽车。
A long time ago, one of his ancestors who lived in Africa went into the forest to cut down a tree to make a drum.
很久以前，他那生活在非洲的祖先中有一人走进森林去砍树来做鼓。