通: open up or clear out by poki ...端: end; extremity不通端: not go end; not go-side不通端量规: not go gauge穿通端子: feedthrough insulator; feedthrough terminal普通端子: ordinary terminal通断: closed open; closed-open; on off通度寺: tongdosa通断按键: on off keying通杜特: toundoute通断比: break-make ratio; make break ratio通杜马: tunduma通断操作: make break operation通杜鲁: tunduru通断测试: on off test; on-off test通杜卢: tundulu