为了等同的对待每个维，适应稀疏数据，必须对多维数组进行划分。
To treat every dimension equally and adapt to sparse data, it is necessary to partition multidimensional array.
稀疏的关联数组(字符串索引)可能在元素之间有间隔。
A sparse associative array (indexed by string) might have gaps between elements.
稀疏的关联数组(字符串索引)可能在元素之间有间隔。
A sparse associative array (indexed by string) might have gaps between elements.
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