基于块的相关算法来计算光流，并利用光流跟踪双手的运动。

Optical flow was computed based on the block relative algorithm, which is used for hand tracking.

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获取运行时跟踪基础结构用于筛选工作流状态事件的工作流跟踪点的集合。

Gets the collection of activity track points used by the runtime tracking infrastructure to filter activity status events.

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为了发现错误，我们必须通过控制流跟踪，以发现变量在哪里被赋值，并确定是否这么做是不正确的。

To find the bug, we have to trace back through the flow of control to find out where the variable was assigned and determine whether doing so was incorrect.

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