短語詞組短語bell cable signal cable 信號電纜jingle bell signal bell 信號鈴block bell signal 閉塞鈴信號bell and flasher signal 平交道警報器bell signal railway 是什么意思Signal bell 信號鈴;信號鐘;振零訊號;旌旗燈號鈴signal alarm bell 信號警鈴;告警鈴 返回 bell signal