Hexamethyleneamine
己烯胺
🗣️ 情景例句
We haven't had any complaint of this kind. Is there any evidence.
我们还从未听过这样的抱怨。有什么证据呢？
Why so mysterious?
干嘛神秘兮兮的？
He is physically mature.
他身体己发育成熟。