Leucoflavin
无色核黄素
🗣️ 情景例句
Would you mind opening your suitcase?
请把您的箱子打开，好吗？
This lady is sweeping the section of sidewalk that her husbands forget.
这位女人在打扫丈夫忘记打扫的人行道。
I'm sorry I don't know. You'd better ask that policeman over there.
对不起，我不知道。你最好问问那边的警察。