zhè ge / chéng shì / de / dì xià tiě dào / shí fēn / biàn jié / shì / shì mín / chū xíng / de / zhǔ yào / fāng shì这个城市的地下铁道十分便捷,是市民出行的主要方式。The subway in this city is very convenient and is the main mode of transport for residents.