Melatonin
[化] 褪黑激素; N-乙酰-5-甲氧基色胺
🗣️ 情景例句
I need multimedia capability for my system.
我的计算机系统需要多媒体功能。
My brother wants to learn how to play the piano.
我的兄弟要去学弹钢琴。
Sometimes we aren't able to get into every building because there are too many steps.
有时我们并不能进每栋楼房，是因为楼梯太多了。