现在消费者只需在移动设备上的支付宝应用程序中输入一个简短的密码就可以支付商品，而不是用现金支付。
Instead of paying by cash, customers now pay for goods simply by typing a short password into Alipay app on their mobile devices.
答：因为每一主题除了正文以外都有一个标题和简短描述，应用程序可以提供渐进公开。
A: Because each topic has a title and short description in addition to its full content, applications can provide progressive disclosure.
使用简短的主题虽然可以节约带宽，但一个设计良好的主题空间则应该更具描述性且允许在订阅应用程序中使用通配符，因此更有实际意义和益处。
Although you can save bandwidth by using short topics, a well-designed topic space that is more descriptive and that allows the use of wildcards in subscribing applications has substantial benefits.
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