The feed reader is an example of a portlet that is added to the shelf and that is not a component.

例如，feed 读取器就是在定制架中添加的不是组件的 portlet。

youdao

On the back end, one server shelf can serve up to 15 players an HD (read: 720p) feed simultaneously, and graphical artefacting is kept to a minimum because it streams over the operator's managed network.

ENGADGET: PlayCast cloud gaming service is coming to the US in 2013, we go hands-on a bit early