净化在英语中可以用 "purify" 来表示。这个词来源于拉丁语的 "purificare"，意为 "to cleanse, to make pure"。例如：

The river was polluted, but now it has been purified and is safe to drink from again. (这条河曾经被污染，但现在已经被净化了，可以再次饮用。)

The air purification system in the house keeps the air clean and healthy to breathe. (房子里的空气净化系统使得空气清洁健康。)

The water purification plant filters out impurities and chemicals to make the water safe for human consumption. (水净化厂过滤出杂质和化学物质，使水对人类消费安全。)

希望这些例句对您有帮助！