Enteramine
血清素, 5-羟色胺
🗣️ 情景例句
Mr. O'Neill is the publisher of several magazines. O'Neill
先生是好几家杂 的发行人。
This is a typewiter.
这是一台打字机。
I borrowed his copy of the timetable.
于是我借他本人的列车时刻表，