earphone
n (usu pl 通常作复数)
(a) either of two receivers attached to each other so that they fit over the ears, used for listening to records, the radio, etc 耳机.
(b) similar device with only one receiver that fits inside one ear 单耳机.
It's quite simple. You put a very hot, wet cloth on your shoulder for one minute. Then put a packet of frozen peas on the shoulder for one minute. And so on and so on.
很简单。你把一块很热的湿布敷在肩膀上一分钟。然后把一包冻豌豆敷在肩膀上一分钟。这样反复几次。
It is also useful for sending pictures, designs, maps and so on.