Humans generally have a poor sense of smell.

通常，人类的嗅觉灵敏度不高。

They have a poor sense of vision, so they rely on birds to alert them to approaching danger.

它们的视力很差，所以它们依靠鸟类来警告它们有危险靠近。

People who started out the study in excellent or good health were 62 percent more likely to die by year 10 if they had a poor sense of smell, his team reported.

他的研究小组报称，如果嗅觉差，那些一开始身体状况良好或极好的成年人10年后死亡的概率会增加62%。