The let instruction can also appear outside rule, specifically as a child of schema, pattern, or phase.

let 指令也可以出现在 rule 之外，直接作为 schema 、 pattern 或 phase 的孩子。

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A common DSL pattern identified in Fowler's book is called fluent interface, which he defines as behavior capable of relaying or maintaining the instruction context for a series of method calls.

Fowler的书中确定的一个公共dsl模式叫作连贯接口，他将其定义为能够为一系列方法调用中转或维护指令上下文的行为。

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In the basis of analyzing and comparing these three methods, an implementation of pattern matching instruction selection is provided.

这篇论文在分析和比较这三种方法的基础上，介绍一个模式匹配的指令选择的实现。

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