Cholamine
膽胺, 乙醇胺
??? 情景例句
I'm sorry, I really don't know.
對不起，我真的不知道。
A man can not spin and reel at the same time.
一心不能二用。
since ground stations and satellites cannot see everywhere.
因為地面工作站和衛(wèi)星不可能看到地球上的每一個地方。