subway用得多于metro
TheTokyosubwayisanintegralpartoftheworld'smostextensiverapidtransitsysteminasinglemetropolitanarea,GreaterTokyo.Whilethesubwaysystemitselfislargelywithinthecitycenter,thelinesextendfaroutviaextensivethroughservicesontosuburbanrailwaylines.
但是东京地下铁公司就用tokyometro（这并非东京唯一的地铁，另一部分归东京都交通局所管）
TokyoMetro(东京メトロ)isoneoftworapidtransitsystemsmakinguptheTokyosubwaysystem,theotherbeingToei.Itisthefirstmostusedsubwaysystemintheworldintermsofannualpassengerrides.
