Annotations are strings that you define that contain information to associate with the track point.
附注是您定义的字串，其中包含与追踪点关联的资讯。
When overridden in a derived class, gets the collection of annotations associated with the track point.
在派生类中重写时，获取与跟踪点关联的批注的集合。
When overridden in a derived class, gets the collection of annotations associated with the track point.
在派生类中重写时，获取与跟踪点关联的批注的集合。
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