Methanedicarbonic acid
[建] 丙二酸
🧩 词语组成解析
🗣️ 情景例句
I'm Elsa Tobin. How do you do?
我叫Elsa Tobin ，你好。
He is eating a lot.
他吃了很多。
So archaeologists have neither history nor legends to help them to find out where the first 'modern men' came from.
于是，考古学家们既缺乏历史记载，又无口头传说来帮助他们弄清最早的“现代人”是从哪里来的。