fouling point indicator

例句：

1. 1. The pollution point indicator is used to measure the amount of pollutants in the air.
   污染点指示器用于测量空气中的污染物含量。
2. 2. The fouling point indicator was developed to help identify the most effective cleaning methods for different types of surfaces.
   污点指示器被开发出来，以帮助识别针对不同类型表面最有效的清洁方法。
3. 3. The fouling point indicator has been shown to be more accurate than traditional methods for detecting oil spills.
   污点指示器已被证明比传统的检测方法更准确地检测到石油泄漏。