The query expression is a building block that can be assembled to define the final selection predicate for the query.

该查询表达式是一个构建块，可以通过组装它为查询定义最后的选择谓词。

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It also provides a method to define a set of hard and soft disk block and file allocation limits and the grace periods before the soft limit becomes enforced as the hard limit.

它还提供了一种方法来定义一组磁盘块和文件分配的硬、软限制，以及软限制强制实施为硬限制前的过渡期。

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In Listing 4, I define product as a code block accepting two parameters.

在清单4中，我将product定义为一个代码块，它接受两个参数。

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Still, our index gives us a chance to look at real estate on a granular level, highlighting the block-to-block differences that really define local markets.

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