Hexides
己糖二酐(脱二水己六醇类)
🗣️ 情景例句
ready for the graduation ceremony,
为毕业典礼做准备，
The mill cannot grind with the water that is past.
覆水难收。
Yes, that's right! Where did you see it?
对，没错！你在哪见过吗？