tū​biàn

mutation

突变 (突變) tū​biàn
mutation verb
a sudden structural change within a gene or chromosome of an organism

The virus has mutated genetically, becoming more contagious.

sudden change verb
a sudden and unexpected change in a situation or state of affairs

Due to a sudden change in the situation, we had to cancel the plan.

Frequency

Movie subtitles
2.33 per million appears in 1% of films
Written text
7.81 per million

Sources

Definitions
CC-CEDICT