Pellagramin
[医] 烟酸
🗣️ 情景例句
Going swimming should be a good way of letting your hair down after a hard day's work.
游泳是在辛苦了一天后放松自己的好方法。
I asked him to come with me , but he wouldn't.
我请他和我一起来，但是他不肯。
This is not my umbrella.
这不是我的伞。