这里介绍几种REBOL中的选择语句，这些方法提供了一个按照关键值运行多种分支的方法。
There are several methods to selectively evaluate expressions in REBOL. These methods provide a way for evaluation to branch many different ways, based on a key value.
这里介绍几种REBOL中的选择语句，这些方法提供了一个按照关键值运行多种分支的方法。
There are several methods to selectively evaluate expressions in REBOL. These methods provide a way for evaluation to branch many different ways, based on a key value.
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