The key point is that when the garbage collector runs, it may or may not free an object that is softly reachable.
关键之处在于，垃圾收集器在运行时可能会（也可能不会）释放软可及对象。
The key point is that when the garbage collector runs, if it encounters a weakly reachable object, it will free the object the WeakReference refers to.
关键之处在于，垃圾收集器运行时如果碰到了弱可及对象，将释放WeakReference引用的对象。
Look at all the reachable or walkable squares adjacent to the starting point, ignoring squares with walls, water, or other illegal terrain.
观察开始点邻近的所有可到达或可行走的方块，忽略有墙，水或其他非法地形的方块。
Look at all the reachable or walkable squares adjacent to the starting point, ignoring squares with walls, water, or other illegal terrain.
观察开始点邻近的所有可到达或可行走的方块，忽略有墙，水或其他非法地形的方块。
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