美国的邮编通常为五位数字。

Zip codes are always five digits in America.

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换句话说，您知道Pamphlet的IS BN一直有五位数字的限制。

In other words, you know that the ISBN of a Pamphlet always has a limit of five digits.

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例如，美国的邮政编码是五位数字加上可选的“4个”限定号码，后者由连字符和四位附加数字组成。

For example, a U.S. ZIP code is five digits plus an optional "plus 4" qualifier composed of a hyphen and four additional digits.

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