variation in level of supports

例句：

1. 1.The population of the city has shown significantvariation over the past decade.
   过去十年里，该市的人口发生了显著的变化。
2. 2. Thegenetic variation between different species is a fascinatingtopic in evolutionary biology.
   不同物种之间的遗传变异是进化生物学中的一个引人入胜的话题。
3. 3. The new model offers a wider rangeof variations than its predecessors.
   这款新模型比其前代产品提供了更广泛的选择范围。