Match at most one occurrence of the preceding expression.
在大多数比赛之一发生前的表达。
I found one occurrence where someone wanted access to more themes.
我发现唯一发生的事情,就是有人提出想在更多的地方控制主题的显示。
The rule is that any given group must have only one occurrence of each member node.
规则是在任何给定的分组中,每个成员节点只能出现一次。
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