这是因为外观对功能有很大的影响：如果一个应用程序看起来很混乱或不合逻辑的话，也必然是很难理解和使用的。

This is because appearance has a strong impact on functionality: an application that appears cluttered or illogical is hard to understand and use.

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例如，在给朋友写信的时候，你可能会使用小写字母，俚语或缩写，甚至有时候单词拼写错误，语法混乱，不过这都没有关系，因为你们的关系亲近，理解对方。

For example, you may write in all lowercase letters, use slang and abbreviations, and perhaps even let misspellings and bad grammar go by, when sending email to your friends.

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