An operator wearing earphone was sitting in the telephone exchange.
戴耳
的接线员正坐在总
室里。
;听筒
;
;
;

, 麦克风;
;

, 扬声
, 喇叭;
,
听筒;
;An operator wearing earphone was sitting in the telephone exchange.
戴耳
的接线员正坐在总
室里。
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