Leucoflavin
无色核黄素
🗣️ 情景例句
I have always worn a clip-on bow tie.
我都是用夹上去的领结。
I'm single.
我现在单身。
I've got a problem and as I don't know what to do I thought I'd write to you and ask for your advice.
我有一个问题，因为我不知道该怎么办。我想我最好写信给你，征求你的意见。