smell可数吗？

　　例句：

　　The smell of the sea took him back to his childhood.

　　大海的气味使他回想起孩提时代。

　　Can you smell something burning?

　　你有没有闻到什么东西烧焦了？

　　Smell is keener in dogs than in humans.

　　狗的嗅觉比人的嗅觉灵敏。