Cryptoflavin
隐黄素
🗣️ 情景例句
After studying an hour, I finally got the hang of the lesson.
我学习了一个小时，终于理解了这一课的要点。
If the hen does not prate,she will not lay.
不叨叨的母鸡不下蛋。
The village is on a river.
它靠近一条小河。