变异 (biàn yì): variation

Scientists discovered that this virus mutated during transmission, and its infectivity became stronger.

After several generations of cultivation, genetic variation occurred in these rice plants, and the yield became much higher than before.

The doctor explained that tumors mutate rapidly, so regular check-ups and adjustments to the treatment plan are necessary.

The call of this bird showed variation, clearly different from its usual call, which attracted the attention of ornithologists.

In the laboratory, by changing the temperature, the researchers observed variation in the structure of the metal material.