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。