Melatonin
[化] 褪黑激素; N-乙酰-5-甲氧基色胺
🗣️ 情景例句
what you need to fix up the old library.
你们修复旧图书馆所需要的东西。
It's a classic!
真是经典！
Many of the tourists on board had begun bargaining with the tradesmen, but I decide not to buy anything until I had disembarked.
船上许多游客开始同商贩讨价还价起来，但我打定主意上岸之前什么也不买。