可以合理地假设，一个特定的规则可能在不同的地方以不同的格式表达，并且可以同时使用多个规则表达式类型。

It is reasonable to assume that a given rule may be expressed in multiple formats at different times, and that multiple rule expression types may be in use in parallel.

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例如要求使用安全带，设定合理限速之类简单易行的规则可以大量降低道路交通死亡的危险。

Easy steps, such as requiring the use of seat belts and setting sensible speed limits, can dramatically reduce the risk of traffic-death.

youdao

您可以通过使用% start来指定一个不同的规则以改变这一行为，但是，将顶层的规则安排在此部分的顶部通常是最合理的。

You can change this by specifying a different rule with % start, but most often it's more reasonable to put the top-level rule at the top of the section.

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