Consider how e-ticketing simplified air travel, how universal product codes made shopping easier or how 800-number-based conference calls made teleconferencing more feasible.

• 想想看电子购票系统如何让搭机旅行变得简单，通用产品码如何让购物变得轻松，以及800开头的会议电话如何让视讯会议变得更加可行。