SK Telecom Co. said su cribers can pay 3,000 won (US.50) to download a sound wave that is inaudible to human ears but a oys mosquitoes within a range of three feet.

• 韩国鲜京电讯公司表示，定制此项服务的用户只需花3000韩元（合2.；50美元）便可下载一种声波。这种声波可以在三英尺的范围内驱赶蚊虫，而人耳却听不见。