P::RD grammars can associate an action with every rule as an integral part of the parsing process. This is very important.

RD 语法可以将动作（action）与每一个规则关联起来，将其作为解析过程中的 一个 完整部分。

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The viaduct of the Inner Ring Rd (IRR)abstract: is the core part of Shanghai viaduct network.

内环线高架道路是上海市高架网络的核心部分。

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The Inner Ring Rd Viaduct forms an important part of the fast viaduct network in Shanghai, but, with the rapid growth of downtown traffic, the demand is now more and more beyond its capacity.

内环高架道路是上海市高架快速路网的重要组成部分。随着上海市中心城区交通量增长，内环线的通行能力已越来越不相适应。

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