这和其它语言中的Lambda表达式或类似结构相似。
This is similar to a lambda and similar constructs used in many other languages.
它用于构建类似于Netflix和Amazon所提供的系统，可根据用户的购买历史向他们推荐产品，或者用于构建可查找特定时间内的所有相似文章的系统。
It's used to build systems like those at Netflix and Amazon that recommend products to users based on past purchases, or systems that find all of the similar news articles on a given day.
另一个站点叫similicio.us, 使用del.icio.us去推荐类似站点，例如这里是它认为和Read/WriteWeb相似的站点。
Another web site called similicio.us uses del.icio.us to recommend similar sites. For example, here are the sites that it thinks are related to Read/WriteWeb.
应用推荐