For example, the key could be a unique user ID, a stock symbol or, in our case, a zip (postal) code.

例如，主键可以是一个唯一的用户ID、一个股票符号，在我们的实例中，主键是一个邮政编码。

youdao

This stock quote service implementation returns unique values for the symbols XXX and YYY, and returns zero for anything else.

这个股票报价服务实现为符号xxx和yyy返回唯一的值，对别的符号则返回零。

youdao

As you stock food, take into account your family's unique needs and tastes.

当你贮存食物的时候，应该考虑你家人的独特需要和口味。

youdao

The point is that aapl is a unique stock.

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