Now look at the search function. This function USES one of the most powerful features of Scala, its pattern matching.

现在参看搜索函数，这个函数使用一个功能最强大的scala特性：模式匹配。

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Compared with the first and second generation expectorant drugs, it has much more powerful expectorant function and lower toxicity, and is one of most clinically-used expectorant drugs.

它是溴已新的活性代谢物，与第一代和第二代祛痰药相比，它毒性低，祛痰作用强，是最常用的祛痰药之一。

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