Result the conception of final target size was put forward, an equation for calculating the movement time of target acquisition was obtained, and a new definition of index of difficulty was given.

结果针对人体的目标拾取运动特征的研究，提出截止目标尺度的概念，推导出人体的目标拾取运动的时间计算方程。

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The difficulty starts out on the incredibly easy side and quickly gets more challenging as new hazards and movement techniques are introduced.

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