Leucoflavin
无色核黄素
🗣️ 情景例句
Without a doubt, things will get worse.
情况无疑会越来越糟。
When I saw Mr. Jones,he was talking with John Smith.
当我看见琼斯先生时，他与约翰·史密斯正在谈话。
He usually stays at home with his pet dog.
他通常跟他的爱犬待在家里。