活动代表出于共同目的捆绑在一起的一组操作。
Activities represent a group of actions that are bundled for a common purpose.
实际上，这个高层对象只是一个名称空间——一个可以将一组功能捆绑在惟一一个名字之下的容器。
Actually, this top-level object is simply a namespace — a container that allows you to bundle a set of functionality under a unique name.
通过将服务器捆绑成一组即用的Eclipse RCP插件，在获得可靠性的同时，能在每个客户端安装时节省大量的配置和测试。
By bundling their server as a turnkey set of Eclipse RCP plugins they save a considerable amount of configuration and testing at each client installation while gaining reliability.
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