An operator wearing earphone was sitting in the telephone exchange.

机的接线员正坐在总机室里。
机;听筒
收话
;

机;
机;
朵;
, 麦克风;
, 扬声
, 喇叭;
;An operator wearing earphone was sitting in the telephone exchange.

机的接线员正坐在总机室里。
声明:以上例
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