natural discharge

例句：

1. 1. The company's natural discharge of wastewater into the river has been a concern for local residents.
   该公司将废水直接排入河流，引起了当地居民的担忧。
2. 2. The scientist found that the natural discharge of carbon dioxide from the atmosphere was causing global warming.
   科学家发现，大气中二氧化碳的自然排放正在导致全球变暖。
3. 3. The engineer designed a system to control the natural discharge of oil and gas from the well.
   工程师设计了一个系统来控制从井中自然排放的石油和天然气。