当你在阅读的时候，在屏幕的底部有标记为读过，在浏览器打开，或者由文本模式转到HTML模式等选项。
Down at the bottom of the screen when reading an app, you have options to mark as read, load in the browser, and switch from text mode to full HTML rendering mode.
然后，复制标记的对象，使所有活跃对象被整理到堆的底部。
Then, marked objects are copied such that all the live objects are compacted at the bottom of the heap.
图表底部的菱形标记表示在该点完成了一个或多个请求。
The diamond-shaped markers at the bottom of the diagram indicate that one or more requests are completed at this point.
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