variation of a measure

例句：

1. 1.The population of the city has undergone significant variations in recent years.
   该市的居民人口近年来发生了显著的变化。
2. 2. Variations in temperature can affect the growth of crops.
   温度的变化会影响农作物的生长。
3. 3. The genetic variation between species is a key factor in evolution.
   物种之间的遗传变异是进化的关键因素。