尽管大多数文章包含开头、主体、结尾部分，但是文章到底应该有几段却没有一个具体的规定。

Although most essays contain a beginning, a middle, and an end, there's no official limit on the number of paragraphs that should appear in an essay.

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污染有害于人类。在正文部分分析了污染会给人类造成哪些具体的危害。最后在结尾部分提出了防治污染的措施。

Measures should be taken to control pollution. Legislative steps should be introduced and pollutants should be trapped before they are poured out of chimneys.

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由此提出降低走廊烟速、减少尾部受热面局部磨损的具体措施。

The methods have been developed to reduce the velocities of gas flow in narrow passages and erosions of heat surfaces in some local places.

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