有两个关键参数npsrpgmin和npsrpgmax，它们设置开始和应该停止重新页面调入垃圾收集时的块数。

There are two key parameters, npsrpgmin and npsrpgmax, which set the number of blocks when re-pagein garbage collection starts and then it should stop.

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我们可以设置复杂规则来控制如何生成地形，但是现在，从简单的内容开始：向数组中添加四个最相邻的图像块的地形类型，然后再随机获取。

We can set up complex rules to govern how terrain is generated, but for now, start with something simple: Add the terrain types of the four closest tiles to the array before picking them randomly.

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