耳机

An operator wearing earphone was sitting in the telephone exchange.

戴的接线员正坐室里。

He constructed the first known treadmill desk along with his laptop and headset in hopes of incorporating more movement for deskbound jobs.

他制造的第一台跑步以及笔记本和，给那些办公室工作的人带来了更的运动会。

Hook the bottom of the earhook onto the lower hinge pin, then lift and pull the top of the earhook over the upper hinge pin.

将挂钩底部按下端的扣上，从下端按扣拉起并将挂钩上端与部扣紧。