了解了这一点，就会明白过多的条件会给以后带来麻烦，使测试和维护变得很困难。
Knowing this, it makes sense that excessive conditionals are challenging to follow, and hence, hard to test and maintain.
坎宁安：维基的作用发挥最好的，就是当你尝试去解答一个无法很容易地描述出来的问题的时候，在那些不存在一个不言自明的结构使你明白接下来你需要了解些什么的领域。
Ward Cunningham : A wiki works best where you're trying to answer a question that you can't easily pose, where there's not a natural structure that's known in advance to what you need to know.
要了解疾病的成因，科学家们必须明白dna出了什么问题，使健康组织产生癌变。
To understand the causes of the disease, scientists have to understand what goes wrong in our DNA that makes healthy tissue turn cancerous.
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