One writer suggests grouping games into four classes depending upon the elements of competition, chance, mimicry, or vertigo (motion alone, i. e. , teeter-tottering).

一位作家建议根据竞争、博彩、模仿和平衡（如跷跷板等运动）的要素将游戏分成四类。

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By helping to rehabilitate vertigo sufferers, it will have shown that it is good for something other than playing games.

ECONOMIST: Vertigo: A new kind of pacemaker | The