variable-mu

例句：

1. 1. The temperature varies greatly throughout the day.
   温度在一天中有很大的变化。
2. 2. The amount of rainfall is a variable factor in predicting weather.
   降雨量是预测天气的一个可变因素。
3. 3.Variables in the model can affect the outcome significantly.
   模型中的变量可以显著影响结果。