③ 段落的中间

最后，main idea也可能出现在段落的中间。作者用几句话介绍话题，提出主要观点，然后用余下的段落来论证。在这种情况下，main idea相对而言更难确定。让我们再看一个例子，你是否能准确定位main idea在哪里呢？

总结文章或段落大意

如果作者没有直接在文章写出main idea，就需要根据文章内容进行推断。

假如将整篇文章想像成一个盒子，盒子里摆放了大量的物品（文章的各种细节）。就像Tri-Bond游戏一样，我们将它们从箱子里依次取出，然后找出其共同点。一旦你发现它们之间的关联，那么文章的main idea就一目了然了。

When you're with your friends, it's okay to be loud and use slang. They'll expect it and they aren't grading you on your grammar. When you're standing in a boardroom or sitting for an interview, you should use your best English possible, and keep your tone suitable to the working environment. Try to gauge the personality of the interviewer and the setting of the workplace before cracking jokes or speaking out of turn. If you' re ever in a position to speak publicly, always ask about your audience, and modify your language, tone, pitch and topic based on what you think the audience's preferences would be. You'd never give a lecture about atoms to third-graders!

作者在这段文字中提供了大量的信息（和朋友出去玩，参加面试和公开发言等），这些事第一眼看上去似乎没有太大的联系。

但如果你找到它们的共同点，就会发现，作者通过不同的场合试图说明，人们的说话方式需要根据场合进行调整（和朋友可以说俚语，面试则要礼貌沉稳，公共场所就要注意自己的语气）。 那么综合来看，“Different situations requires different kinds of speech”就是文章隐含的main idea。

寻找文章中重复的信息

如果文章提供的提供的信息太多，你不知道如何总结，那么你可以找一找作者在文中反复强调的单词、短语或观点。例如：

A new hearing device uses a magnet to hold the detachable sound-processing portion in place. Like other aids, it converts sound into vibrations. But it is unique in that it can transmit the vibrations directly to the magnet and then to the inner ear. This produces a clearer sound. The new device will not help all hearing-impaired people - only those with a hearing loss caused by infection or some other problem in the middle ear. It will probably help no more than 20 percent of all people with hearing problems. Those people who have persistent ear infections, however, should find relief and restored hearing with the new device.

显然，这段话总重复出现的信息是 “a new hearing device”，也就是作者强调的重点。那么整段文字表达的中心思想便可推断出：“A new hearing device is now available for some hearing-impaired people. ”

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