variation

/ˌvɛriˈeɪʃən/

an instance of change; the rate or magnitude of change

中文释义：变化；变异

Genetic variation is essential for the survival of a species.

遗传变异对物种的生存至关重要。

There is a wide variation in temperature between day and night in deserts.

沙漠中昼夜温差很大。