For swimming pools using ozone for disinfection, ensure that the water should contain not less than 0.5 Parts per million of chlorine.是什么意思_For swimming pools using ozone for disinfection, ensure that the water should contain not less than 0.5 Parts per million of chlorine.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句