在本示例中，适配器将输入文件拆分为两个数据块，分别对应着两个记录。

In this case, the adapter splits the input file into two chunks corresponding to two records.

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可以将文件视为单个大数据块，或者视为由分隔符彼此分隔开的许多不同记录的集合。

A file can be treated as a single large block of data or, alternatively, as a collection of many distinct records delimited from one another by separators.

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例如，以上的代码将把文件名为 v=w2.80&hl=en&x=228&y=4&zoom=15&s=Gal 的图像块记录到 (column,row) 散列中的位置 0,4 中。

For example, the code above will record a tile with a filename like v=w2.80&hl=en&x=228&y=4&zoom=15&s=Gal to be at position 0,4 in the (column,row) hash.

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