对于读取请求，首先查看缓存。

On a read request, first check the cache.

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最后，对于读取环境变量，有两个函数。

Finally, for reading environment variables there do exist two functions.

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类型子句也指定了传入键和值，这对于读取文件分别是字节数和文本行数。

The type clause also delineates the incoming key and value, which in the case of reading a file are the byte count and the line of text, respectively.

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