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ConstantQuantity327ConstantQuantity 是含不变值的 PhysicalQuantity，如 3 Meter 和 5 HourDuration。所有 ConstantQuantity 的...^
    TimeMeasure88这个是通用时间轴(TimePosition 的实例)上的类别， 它包括时间段(TimeDuration 的实例)，与 TimePoint 和 TimeInterval 的定位。^
        TimeDuration8这是任何量度时间的衡量，它可以是是基于通用时间轴的， 也可以是不基于通用时间轴的的。^
        TimePosition78这是从 NegativeInfinity到 PositiveInfinity 通用时间轴上的任何 TimePoint 或 TimeInterval。^

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