改善地图限制，防止玩家到达场外地区。
Improved clipping to prevent players from getting to unintended places.
在示例应用程序中，存储库所能存储的数据地图的实例是有限制的。
In the sample application, the repository has a limit of data map instances it can store.
要防止地图重载，必须将所有动作都限制为单一页面加载。
To prevent the map from reloading, you must restrict all activity to a single page load.
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