轨道的锁定状态。（只读）
请注意，锁定轨道仅影响 Timeline Editor 中的操作。不会阻止其他 API 调用更改轨道或其剪辑。
此属性指示一个轨道是否因为其 locked 属性已启用或其父轨道为锁定状态而在 Timeline Editor 中被锁定。
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