Each chunk is a direct index to the pointer array of the corresponding level: the first left-hand-side chunk to the first-level nodes, the second chunk to the nodes of the second level, and so on.
每个小块便是相应层的指针数组的直接索引：最左边的小块指向第一层节点，第二个小块指向第二层的节点，依此类推。
Each chunk is a direct index to the pointer array of the corresponding level: the first left-hand-side chunk to the first-level nodes, the second chunk to the nodes of the second level, and so on.
每个小块便是相应层的指针数组的直接索引：最左边的小块指向第一层节点，第二个小块指向第二层的节点，依此类推。
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