exponential gradient device

例句：

1. 1.The exponential gradient device is used to measure the concentration of pollutants in water.
   指数梯度装置用于测量水中污染物的浓度。
2. 2.The exponential gradient device can be used to detect the presence of bacteria in food samples.
   指数梯度装置可以用来检测食品样本中的细菌。
3. 3.The exponential gradient device is a powerful tool for analyzing chemical reactions.
   指数梯度装置是分析化学反应的强大工具。