不变 bùbiàn invariant Definitions Defs Origin Strokes Stroke Words Sentences Sents 1 sentence 在复杂的公式变换过程中,这个常数始终保持不变。 zài fùzá de gōngshì biànhuàn guòchéng zhōng, zhège chángshù shǐzhōng bǎochí bùbiàn. During the complex transformation of the formula, this constant stays the same. Source: Dong Chinese Dictionary