老师给出一篇文章“冰箱是如何制冷的”，从题目就可以看出这是一篇说明文，文章内容就是讲述冰箱制冷量的原理。假设这篇文章共分为四个段落，我们就可以把四个段落分别提炼出一个小标题，然后再将四个小标题连接起来，就是一个简单的总结。要注意的是�

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