It also provides a mechanism to perform full Boolean queries against these Categories (e.g. ANDs and ORs).
它还提供了一种机制可以对这些类别执行全部的布尔操作(如，AND和OR)。
We discussed the problems with Boolean notation in Chapter 2. We determined that just because the program needs to understand Boolean queries, users shouldn't be forced to as well.
我们在第2章中讨论过布尔符号存在的问题，我们认为，不能因为程序需要理解布尔查询，所以也迫使用户去理解它。
We discussed the problems with Boolean notation in Chapter 2. We determined that just because the program needs to understand Boolean queries, users shouldn't be forced to as well.
我们在第2章中讨论过布尔符号存在的问题，我们认为，不能因为程序需要理解布尔查询，所以也迫使用户去理解它。
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