variable reduction

例句：

1. 1. The temperature is a variable that can affect the outcome of experiments.
   温度是一个可变因素，可以影响实验的结果。
2. 2.The weather forecast predicts changes in temperature and precipitation.
   天气预报预测了温度和降水的变化。
3. 3.The team's performance was influenced by the variable factors of fatigue and hunger.
   团队的表现受到了疲劳和饥饿等可变因素的影响。