vanishingly

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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。
“Were global temperature not increasing, ” he said, “the chance of an extreme heat wave such as the one Moscow experienced, though not impossible, would be vanishingly small.
他说：“若全球气温没有增加像莫斯科经历的那种高温出现的几率（虽然不可能），那这种可能性会很小很小。”
However, sadly (or perhaps reassuringly) for the vanishingly small subset of conspiracy theorists who know and care about the conference, that is about where the resemblance ends.
然而，对于难以察觉的一小部分阴谋论者来说是遗憾的（或者说是安慰的），他们了解而且关心这次会议，但这次会议就是不同之处的开端。

So, the chances of getting any activity from these inner shell of electrons are vanishingly small.
所以，内层电子间,进行反应的可能性,是很小很小的。
麻省理工公开课 - 固态化学导论课程节选
And carbon 14, 6 again and it has 8, and it is found in vanishingly small amounts, 10 10 to the minus 12 or part per trillion.
碳14，6个质子，8个中子，它的存在是非常微小的，几乎趋于零，万亿分之。
麻省理工公开课 - 固态化学导论课程节选
as long as it's small and finite, will lead to some small infinite errors in the formula, but remember it's got to be in the end made to be vanishingly small.
只要它只是有限小,就会在公式中引起无限小的误差,但请记住,Δt最后变得难以察觉地小
耶鲁公开课 - 基础物理课程节选

So what was once a vanishingly rare event becomes a rare one, then a common one.
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used to emphasize how small, rare, etc. something is, so that it almost does not exist