Melatonin
[化] 褪黑激素; N-乙酰-5-甲氧基色胺
🗣️ 情景例句
While it may be cold outside, it's always warm here in the office.
外面可能很冷的时候，办公室里面总是很暖和。
What's all this noise?
这可怕的声音是什么？
I want to improve, but I don't know how.
我想提高它，但又不知道怎么样才能提高。