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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That's the "TMC 2" in the regular expression toward the top of the block.

那是接近代码块顶部的正则表达式中的 “TMC 2”。

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The while loop, which executes a block of statements as long as a test expression is true.

while循环，它当一个测试表达式为true时执行一个语句块。

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