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an invariant of sth
作名词时常见于数学、物理语境，常与 of 或 under 搭配；可数名词，复数为 invariants。
Energy is an invariant of a closed system.
能量是封闭系统的不变量。
不变量；不变式
先理解核心含义，再看它在真实句子里的用法。
不变量；不变式
A quantity, function, or other entity that remains unchanged under a given set of transformations or conditions.
Energy is an invariant of a closed system.
能量是封闭系统的不变量。
不变的数量、函数等。
An invariant quantity, function etc.
In physics, the speed of light in a vacuum is an invariant under Lorentz transformations.
在物理学中，真空中的光速是洛伦兹变换下的不变量。
Loop invariants are used to verify the correctness of algorithms.
循环不变量用于验证算法的正确性。
The Euler characteristic is a topological invariant that remains constant for a given surface.
欧拉示性数是一个拓扑不变量，对于给定的表面保持不变。
作名词时常见于数学、物理语境，常与 of 或 under 搭配；可数名词，复数为 invariants。
Energy is an invariant of a closed system.
能量是封闭系统的不变量。
The norm is an invariant under orthogonal transformations.
该范数是正交变换下的不变量。
Not this
This is a invariant.
Use this
This is an invariant.
invariant 以元音音素开头，前面的不定冠词要用 an，不能用 a。
Not this
There are several invariant in this equation.
Use this
There are several invariants in this equation.
invariant 是可数名词，与 several 连用时必须用复数形式 invariants。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
拓扑不变量
The number of holes is a topological invariant of a surface.
孔洞的数量是曲面的一个拓扑不变量。
循环不变量
A loop invariant can be used to prove program correctness.
循环不变量可用于证明程序的正确性。
类不变量
The class invariant must hold after any public method is called.
在调用任何公有方法之后，类不变量必须成立。
在……作用下的不变量
The distance between two points is an invariant under rigid motions.
两点之间的距离是刚体运动下的不变量。
几何不变量
The cross-ratio is a geometric invariant under projective transformations.
交比是射影变换下的一个几何不变量。
Use invariant naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 invariant 拆成 in-（不）和 variant（变体）：一个量怎么变都不变，就是“不变量”。
语域：formal 常见场景：数学或物理学讨论中、正式学术写作中 invariant 作名词时通常用于数学、物理等专业领域，表示在某种变换或条件下保持不变的量、函数或性质。在日常口语中不太常见，多出现在学术论文或教材里。
复数形式为invariants
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