减慢应用程序的回放时间，从而允许 Unity 在各个帧之间保存屏幕截图。
与 captureDeltaTime 相同，但使用 RationalTime 表示法。返回的 timeAsRational 与相同的离散化增量值（TicksPerSecond）共享。将其设置为 0 或无效值会还原正常的 Unity 时间管理。
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