1
be an infinitesimal
be + an infinitesimal 表示“是无穷小量”；infinitesimal 是可数名词。
A non-zero quantity smaller than any positive number is an infinitesimal.
一个小于任何正数的非零量就是无穷小量。
极微小的事物；微量
先理解核心含义，再看它在真实句子里的用法。
极微小的事物；微量
an extremely small amount or thing
A non-zero quantity smaller than any positive number is an infinitesimal.
一个小于任何正数的非零量就是无穷小量。
用于日常语，指极小或微不足道之物
非零且绝对值小于任何正数的量(按定义非实数)。
A non-zero quantity whose magnitude is smaller than any positive number (by definition it is not a real number).
无穷小量
(mathematics) a variable that has zero as its limit
无限小的事物。
Something infinitesimally small.
In calculus class, we learned that an infinitesimal is a quantity smaller than any positive real number.
在微积分课上，我们学到无穷小量是比任何正实数都小的量。
The scientist described the tiny difference in the readings as an infinitesimal.
科学家把读数上的微小差异描述为一个无穷小量。
Some physicists use infinitesimals to model changes that are almost too small to imagine.
一些物理学家用无穷小量来模拟几乎小到难以想象的变化。
be + an infinitesimal 表示“是无穷小量”；infinitesimal 是可数名词。
A non-zero quantity smaller than any positive number is an infinitesimal.
一个小于任何正数的非零量就是无穷小量。
treat...as... 后接名词短语作宾语补足语，意为“把……当作……”。
For simplicity, physicists treat this tiny change as an infinitesimal.
为简化起见，物理学家把这个微小变化视为无穷小量。
复数形式表示多个或一类无穷小量，动词用复数。
These infinitesimals approach zero but never equal zero.
这些无穷小量趋近于零，但永远不会等于零。
Not this
Infinitesimal is a fundamental concept in calculus.
Use this
An infinitesimal is a fundamental concept in calculus.
infinitesimal 作名词时为可数名词，单数形式作主语需加不定冠词 an 表示“一个无穷小量”；缺少冠词不符合可数名词单数的语法。
Not this
There are many infinitesimal in this equation.
Use this
There are many infinitesimals in this equation.
infinitesimal 的复数形式是 infinitesimals；many 后需要用可数名词复数，所以要在词尾加 -s。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
一个正无穷小量
In nonstandard analysis, a positive infinitesimal is smaller than every positive real number.
在非标准分析中，正无穷小量小于每个正实数。
一个非零无穷小量
A nonzero infinitesimal has a magnitude smaller than any positive real number.
非零无穷小量的绝对值小于任何正实数。
一阶无穷小量
They approximated the change using an infinitesimal of the first order.
他们用一阶无穷小量来近似这个变化。
微积分中的无穷小量
The infinitesimals of calculus were debated before the rigorous theory of limits was developed.
在严格的极限理论建立之前，微积分中的无穷小量曾引发争论。
Use infinitesimal naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 infinitesimal 拆成 infinite + small 的变体，想象正数轴上无限接近 0 但仍非 0 的灰尘，即无穷小量。
语域：formal 常见场景：数学论述、学术写作、正式书面语 infinitesimal 作名词时通常用于数学或学术、技术文本，指“无穷小量”或“极微小的量”；在日常口语中较少单独使用，更常见的说法是 very small amount 或 tiny amount。
Rhymes with decimal, which shares the final /ɛsɪməl/ sound. Animal, minimal, and maximal share the spelling -imal but do not rhyme: their stressed vowels are /æ/, /ɪ/, and /æ/ respectively, not /ɛ/.
Dictionary facts from ECDICT, WIKTIONARY.