Message in Chinese (Simplified) (中文(简体))
        “XAML”中 Timeline 的子级还必须是 Timeline 或 Timeline 派生的类。
Unlocalized message
        A child of a Timeline in "XAML" must also be a Timeline or a class that derives from Timeline.
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“XAML”中 Timeline 的子级还必须是 Timeline 或 Timeline 派生的类。

A child of a Timeline in "XAML" must also be a Timeline or a class that derives from Timeline.
Search by Google