if (chunks === null) {
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.
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之后就是一些特殊穿戴的锻炼了，比如帽子、手套、围脖、口罩这些。。搜狗输入法下载对此有专业解读