It's one of the most common cancers, and affects two to threetimes as many men as women.

膀胱癌是常见的一种癌症，男性发病率是女性的两到三倍。

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Our ruleof thumb in our books is to show the same code context two or threetimes before switching to just the snippets (although this rule variesgreatly with the type of code).

我们的经验是：把代码放在上下文中出现两三次以后，才开始只展示代码片断（虽然 这条规则随不同的代码有很大变化）。

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