变异 biànyì variation
How to remember 变异: 变 change + 异 different = variation.
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How it is used
- 'Variation / mutation' - a biology term: 基因变异 (jīyīn biànyì) genetic mutation, 病毒变异 viral mutation.
- Note it can be verb or noun. In genetics/epidemiology it's the standard word for organisms changing form; became very common in pandemic news.