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invariant [in'vɛəriənt]

a. 无变化的,不变的
n. 不变量

名　词：in·var'i·ance

a feature (quantity or property or function) that remains unchanged when a particular transformation is applied to it

unaffected by a designated operation or transformation
persistent in occurrence and unvarying in nature
[同] constant, invariant, unvarying, changeless
[例]
- maintained a constant temperature
- principles of unvarying validity

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