Carefully document all boilerplate macros, especially the introduced variable bindings and all changes between versions.

仔细地在文档中记录所有样板宏，尤其是引入的变量绑定和版本之间的所有变化。

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SELECT: Returns a set of variable bindings that satisfy the query (similar to SQL SELECT).

SELECT：返回满足查询的一组变量绑定(类似SQL SELECT)。

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Using macros like this significantly reduces typing because you do not have to constantly be writing and rewriting variable bindings, derivations, and parameter passing.

使用这样的宏可以显著减少代码输入量，因为不必不断地编写和重新编写变量绑定、派生和参数传递。

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