vanishingly，英语单词，主要用作副词，作副词时译为“难以察觉地；消遁似地；趋于零地”。

be vanishingly rare 濒临灭绝

are now vanishingly rare 多数都已然濒危

The gene is vanishingly rare in humans, found in less than 3% of people.这个基因在人类中极及罕见，只有不到3%的携带人群。

The trouble is that, while cells within cells are common in eukaryotes, which often engulf other cells, they're vanishingly rare in more rigid bacteria.问题是，虽然胞内同生在真核生物中非常常见，这往往造成吞噬其他细胞，但是在较为硬质的细菌难以察觉。

On one estimate, almost a third of its work concerns alleged human-rights violations, which made up a vanishingly small percentage of the law lords’ caseload a decade ago.据估计，侵害人权的指控占几乎他们工作的三分之一，而在二十多年前这在法官们的待处理案件中只是可以忽略不计的部分。