When the mobile telephone companies invented SMS, they had no idea what it was for; it was only when that technology got into the hands of teenage users that they invented the use.
手机公司发明短信技术的时候， 根本不知道能用它来干什么， 一直等到这个技术到了 年轻用户手上的时候， 他们才发明了它的用处。