The sense of smell explores; deleterious substances almost always have an unpleasant smell.

The sense of smell explores; deleterious substances almost always have an unpleasant smell.

嗅觉探索;有害物质几乎总是有一种难闻的气味。

-- Jean Anthelme Brillat Savarin 让·安塞尔·布里亚特·萨瓦林