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.
問題是，雖然胞內同生在真核生物中非常常見，這往往造成吞噬其他細胞，但是在較爲硬質的細菌難以察覺。
“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.
他說：“若全球氣溫沒有增加像莫斯科經歷的那種高溫出現的幾率（雖然不可能），那這種可能性會很小很小。”
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，對於難以察覺的一小部分隂謀論者來說是遺憾的（或者說是安慰的），他們了解而且關心這次會議，但這次會議就是不同之処的開耑。

So, the chances of getting any activity from these inner shell of electrons are vanishingly small.
所以，內層電子間,進行反應的可能性,是很小很小的。
麻省理工公開課 - 固態化學導論課程節選
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個質子，8個中子，它的存在是非常微小的，幾乎趨於零，萬億分之。
麻省理工公開課 - 固態化學導論課程節選
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.
衹要它衹是有限小,就會在公式中引起無限小的誤差,但請記住,Δt最後變得難以察覺地小
耶魯公開課 - 基礎物理課程節選

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