n. replicator
重复修饰符必须与其他模式组合，修饰符本身没有含义。
A repetition modifier must be combined with other patterns; the modifier has no meaning by itself.
设置一个单一值，它将以此为间隔设置重复的制表符。
重复修饰符可以指定数量，如没有、一个、多个、一个或多个，零或一个、五到十个，以及恰好三个。
A repetition modifier can specify amounts such as none, one, or more; one or more; zero or one; five to ten; and exactly three.
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