短語詞組短語press to talk switch 按鍵通話開關pendnext to pull switch 拉線開關back to back switch 主從背對背開關connecting to the switch 連接到交換機Switch to -switch 節(jié)點到節(jié)點push to break switch 雙位壓動式轉(zhuǎn)換開關push to talk switch 按鈕操縱的傳話開關;壓簧通話開關open to the switch 消息來看switch -to- 機對交換機;節(jié)點到節(jié)點 返回 to switch