“<var>X</var>”的 Duration 必须有一个 TimeSpan，或者其最后一个 KeyFrame 的 KeyTime 必须有一个 TimeSpan。此“<var>X</var>”的 Duration 为“<var>Y</var>”，其最后一个 KeyFrame 的 KeyTime 为“<var>Z</var>”，因此无法解析 KeyTime。

'<var>X</var>' must have either a TimeSpan for its Duration or a TimeSpan for the KeyTime of its last KeyFrame. This '<var>X</var>' has a Duration of '<var>Y</var>' and a KeyTime of '<var>Z</var>' for its last KeyFrame, so the KeyTimes cannot be resolved.

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