to purify

• 气体的净化

  gas purification

• 净化污水

  treat waste water

• 净化过的水

  purified water

• 净化设备

  cleaning equipment

• 大气净化问题

  problem of atmospheric cleansing

• 净化心灵

  purify one's soul

• 净化社会风气

  clean up social morality