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equivalence of X and Y
The equivalence of mass and energy is a cornerstone of relativity.
质量与能量的等价性是相对论的基石。
相等；等价；等值
equivalences — plural of equivalence
先理解核心含义，再看它在真实句子里的用法。
相等；等价；等值
The condition of being equal in value, amount, meaning, or importance.
The equivalence of mass and energy is a cornerstone of relativity.
质量与能量的等价性是相对论的基石。
等价或基本相等的状态。
The condition of being equivalent or essentially equal.
等价关系；≡；~
An equivalence relation; ≡; ~
两个命题同真或同假的关系；逻辑等价。
The relationship between two propositions that are either both true or both false.
原子化合力的量,以氢为单位；可与一个原子化合或被置换的氢原子数；化合价。
The quantity of the combining power of an atom, expressed in hydrogen units; the number of hydrogen atoms can combine with, or be exchanged for; valency.
The equivalence of the two mathematical expressions was confirmed by the proof.
这两个数学表达式的等价性通过证明得以确认。
In economics, the equivalence of goods is often measured by their exchange value.
在经济学中，商品的等价性通常用交换价值来衡量。
The equivalence between the two chemical compounds means they can be used interchangeably.
这两种化合物之间的等价性意味着它们可以互换使用。
The equivalence of mass and energy is a cornerstone of relativity.
质量与能量的等价性是相对论的基石。
There is a clear equivalence between the two theories.
这两种理论之间有明显的等价性。
当强调对应关系时，常用'of...to...'结构。
The equivalence of one currency to another fluctuates daily.
一种货币对另一种货币的等值每天都在波动。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
等价关系
An equivalence relation is reflexive, symmetric, and transitive.
等价关系具有自反性、对称性和传递性。
逻辑等价
Logical equivalence means two propositions always have the same truth value.
逻辑等价意味着两个命题的真值总是相同。
等价类
Each equivalence class contains all elements related to a given element.
每个等价类都包含与某个给定元素相关的所有元素。
等效原理
The equivalence principle is a central idea in general relativity.
等效原理是广义相对论的核心思想。
错误等同
The article was criticized for drawing a false equivalence between the two scandals.
这篇文章因将这两个丑闻错误地等同起来而受到批评。
Use equivalences naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 equivalence 拆成 equi（相等）+ valence（价值），想象天平两端价值完全相等，即“等价/相等”。
语域：formal 常见场景：academic writing、formal reports、professional discussions equivalence 多用于正式或书面场合，常见于学术论文、正式报告和专业讨论，日常口语中较少使用。
通常不可数，但在特定语境下可数，如不同等价关系。
Dictionary facts from ECDICT, WIKTIONARY, WORDNET.