Do not install a series 919 with a strainer in rarely used water lines, such as a fire sprinkler system which is only used during emergencies.是什么意思_Do not install a series 919 with a strainer in rarely used water lines, such as a fire sprinkler system which is only used during emergencies.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句