Monochromatic vision is very rare among land species, because color vision is a tool for survival in terrestrial habitats.

单色视觉能力在陆地生物中非常罕见，因为分辨颜色的能力是陆地生物生存的一项工具。

youdao

The study is rare because while it makes sense that therapy might ease some of the stress of cancer treatment, few studies have shown it can boost a woman's survival.

本次研究表明该疗法可能会减少肿瘤治疗过程中的压力，但却不太可能会提高女性的生存率。

youdao

Rare events that might have an impact on an individual's survival or reproduction should have a special fast lane into the memory bank-and they do.

对于那些可能影响个体生存和繁衍的不寻常事件，它们理应有一个能够优先进入人的记忆库的快速通道，而事实也是如此——这个快速通道叫做ot 2 b肾上腺素受体，是在人的扁桃体中发现的。

youdao

With less than 150 breeding females in the world, Whitebred Shorthorns are on the Rare Breeds Survival Trust's critical list.

BBC: Injured heifer

The Rare Breeds Survival Trust (RBST) has removed the sheep from its annual watch list of native breeds "of genetic conservation importance".

BBC: Shropshire Sheep are officially 'no longer rare'

Big Blue is a rare example of corporate survival: few companies last that long, and at times it didn't look as if IBM would either.

ECONOMIST: Leaders