purification by chromatography

例句：

1. 1.The process of purification is crucial forthe production of pharmaceuticals.
   纯化过程对于制药生产至关重要。
2. 2.The company's commitment to environmental protectionhas led to significant improvements in its purification processes.
   公司对环境保护的承诺已导致其净化工艺的显著改进。
3. 3. The purification of water is essential for maintaining ahealthy ecosystem.
   水的净化对于维护健康生态系统至关重要。