natural purification

例句：

1. 1. The process ofnatural purification is crucial for maintaining waterquality.
   自然净化过程对于保持水质至关重要。
2. 2. Inthe absence of modern technology, natural purification methods were used to treat wastewater.
   在没有现代技术的情况下，人们使用自然净化方法来处理废水。
3. 3. The company'scommitment to environmental sustainability has led tothe implementation of natural purification systems intheir facilities.
   该公司对环境可持续性的承诺导致了在其设施中实施自然净化系统。