communication cord

cord that passes along the length of a train inside the coaches, and that passengers can pull to stop the train in an emergency （火车车厢内供乘客紧急制动时拉的）警报索.

common noun, common sense, common time, common-room, commoner, commonly, commonplace, commons, commonsense, commonsensical, commonwealth, commotion, communal, communally, commune, communicable, communicant, communicate, communicate with, communication, communicative, communicator, communion, communique, communism, communist, communistic, community, community centre, community chest, community home, community singing, commutable, commutation, commutator, commute, commuter, compact, compact disc, compactly,