其中的图形更容易查看，并且缩放功能已得到改进。
The graphics are easier to view, and the zoom function has been improved.
根通过提供各种图形层(例如连接层和句柄层等)以及可能会在查看器级别提供的视图缩放或其它功能，为内容打下基础。
The root lays the foundation for the contents by providing various graphical layers, such as connection layers, handle layers, etc., and possibly zoom or other functionality at the viewer level.
还可以对你所查看的页面进行缩放，测量页面中两点间的距离。
Also you can Zoom the page you are viewing and measure distances between any two points on the page.
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