Spread over many pages, they offer extensive product descriptions but are nevertheless printed and packed in a compact format.
它们以许多个页面提供丰富的产品资讯，但仍然是以紧凑的格式来印刷和包装。
The role of unpack is to unpack the string (presumably packed by pack(fmt, ...)) according to the given format.
Unpack 的任务是根据给定的格式对字符串进行拆包（假设由 pack(fmt, ...) 进行包装）。
The job of pack is to return a string containing the values v1, v2,... packed according to the given format.
Pack的任务是返回一个包含根据给定格式对v 1、v 2、…的值进行压缩的字符串。
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