事件跟踪可以用来测量网站上的各种行为，比如PDF文件下载、页面打印、与页面滚动的互动和视频观看等。
With event tracking, you can measure all kinds of activity on your website such as PDF downloads, printing pages, interaction with a slidehow, watching videos and much more.
版本A会退化为单一滚动页面，而版本b退化为多页面版本。
Where version a degrades into a single scrolling page, version B degrades into multiple pages.
向下滚动页面，以展示每个事件都在自己的页面上。
Scrolling down the page shows that each of the events is on its own page.
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