耳机

An operator wearing earphone was sitting in the telephone exchange.

戴机接线员正坐在总机室里。

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

他制造第一台跑步机以及笔记机，给那些在办公室工作人带来了更运动机会。

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.

将机挂钩底部按在机扣上，从按扣拉起并将挂钩上与机顶部扣紧。