Adding new end-user features and modifying existing ones can prove much simpler with a highly reusable service layer.

可以证明，对于高度可重用的服务层来说，添加新的最终用户功能和修改现有的功能要简单得多。

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At the user interface layer, the subscriber-specific portlet configuration is responsible for maintaining the ID and keeping the IDs associated with the subscriber's end-users.

在用户界面层，订阅者特定的Portlet配置负责维护该ID和保存与订阅者的最终用户关联的ID。

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There were little user interface changes like a close button on each tab, and back-end improvements like a SQLite data storage layer for bookmarks and history.

用户界面有一些小改动，如每个选项卡上的关闭按钮；后端的改进，比如书签和历史记录的 SQLite 数据存储层。

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