Antipellagra vitamin
[化] 抗糙皮病维生素; 维生素PP
🧩 词语组成解析
🗣️ 情景例句
We started by making safety equipment for many sports.
我们是以做运动产品的安全器材起家的。
They that live longest must die at last.
活得最久长，终难免一亡。
Can't you see? Look! It has an egg in it.
你没看见吗？瞧！里面有一只蛋。