In a British study, sales teams used one of three headsets - left, right, both ears - for a day's selling of insurance by telephone. Those who wore the headset on their left ear outsold the others.

在英国开展的一项调查中，电话销售保险的小组使用了三种耳机——左耳机，右耳机，双耳机——一天下来，使用左耳机的销售人员业绩最好。

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Phone neck refers to neck pain caused by holding a telephone between one's shoulder and ear for extended periods. It is one of the modern white-collar ailments.

电话脖(phone neck)指把电话夹在肩膀和耳朵之间很长时间引起的颈部疼痛，是现代白领病的一种。

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A device that converts electric signals, as from a telephone, stereo, or radio receiver, to audible sound and fits over or in the ear.

耳机一种传递电子信号的设备，比如从电话、立体声或广播接收器上传出可听的声音。这种设备嵌到耳朵上或耳朵里。

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Acoustic shocks are defined as "any temporary or permanent disturbance of the functioning of the ear, or of the nervous system, which may be caused to the user of a telephone earphone by a sudden sharp rise in the acoustic pressure produced by it".

BBC: NEWS | Health | Call centre staff 'hearing risk'