Appurtenant work,which supplies a system of function as management,charge,monitoring,maintaining,rescue and service,is a major component part of expressway.是什么意思_Appurtenant work,which supplies a system of function as management,charge,monitoring,maintaining,rescue and service,is a major component part of expressway.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句