场景2：使用Directory Assistance进行名称映射：解析多重匹配。
Scenario 2: Name mapping using Directory Assistance: resolving multiple matches.
正则表达式中有修饰符，它们既可以在表达式内部也可以在表达式外部： 区别大小写、向前查找（lookahead）、多重匹配、忽略空格、匹配的数目等。
There are modifiers to the regular expressions, both inside and outside the expression: case-insensitivity, lookahead, multiple matches, ignoring whitespace, number of matches, and so on.
无序介质激光是由该介质的非周期—类结构与相匹配的泵浦光场相互作用时其整体多重散射的干涉效应产生的。
When the quasi-periodic quasi-structure of random medium interacts with matching pump light, the interference effect under its whole multiple scattering leads to lasing in random medium.
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