Hexahydropyridine
[化] 哌啶
??? 情景例句
If he says he's going to be here, he's here.
假如他說他要來這兒 他就一定會來。
In elementary school,the child learns to read and write.
在小學，孩子學習讀寫。
Really? You came at a bad time of year, I'm afraid!
真的？恐怕你來的不是時候。