货币符号总是由三个字母组成，第一、三个字母用于识别国家，第三个字母则用于代表其货币名。

Currency symbols always have three letters, where the first two letters identify the name of the country and the third letter identifies the name of that country's currency.

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它还有问题：Zipcode已足够识别国家与城市，因此，这些属性应当被迁移到city表(而不是状态表)，但是该数据是静态的，因此我们可以不必理会。

It still has issues: Zipcode is enough to identify the city and state, so those attributes should migrate to a city table (instead of a state table), but that data is static, so we'll leave it alone.

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您可以想象到通过类似的算法根据国家代码识别国际电话号码。

You can imagine a similar algorithm for an international number with a country code.

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