variation of the rate

例句：

1. 1. The temperature variation is significantduring the day.
   温度在一天中的变化是显著的。
2. 2. The genetic variation between differentspecies is a fascinating topic.
   不同物种之间的遗传变异是一个引人入胜的话题。
3. 3. Thestudy of variation in language usage has becomeincreasingly important.
   语言使用中的变异研究变得越来越重要。