Leucoflavin
无色核黄素
🗣️ 情景例句
Excuse me. Can you help me?
对不起 你能帮帮我吗
He has that book, doesn't he?
他有那本书，是吗？
Could you come here, please? I want some help.
你能来这儿一下吗？我需要帮忙。