Aithioic acid
[机] 二硫羧酸
🧩 词语组成解析
🗣️ 情景例句
This weekend, I can't wait.
这个周末，我已等不及了。
Last month was December,wasn't it ?
上个月是十二月，对不对？
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。