经常坐地铁出行的你,可能都会听到车站、列车内,或是站台上穿黄色衣服的志愿者的安全提示;但是你是否观察过地铁每次都会精准地停靠在画线区域内;是否看到过列车关门后,乘务员都要手指车门处的监 You who travel often on the subway may all hear safety tips from volunteers wearing yellow clothes at the station, in the train, or on the platform. However, have you ever observed that the subway will be parked precisely in the area of ​​the drawing line every time; After the train had been closed, the attendants had to supervise the finger door