and even more amazing in its ability to reduce heart attack and stroke risk.

　　Aspirin is the first member of a class of substances called nonsteroidal anti­inflammatory drugs(NSAIDs非甾体抗炎药) .These drugs reduce pain，fever and inflammation，and are used to treat a variety of conditions.Many believe that aspirin has many benefits not yet fully understood.Media reports on the use of aspirin to prevent or treat diseases such as heart attacks and cancer leave many people struggling to keep all the facts straight.Others who cannot tolerate aspirin might feel a bit left out as new uses and benefits of aspirin continue to appear in the news.

　　In all cases，more researches are needed to determine what benefits aspirin may provide and whether these benefits would outweigh the potential side effects.Aspirin，for example，is known to cause gastrointestinal(胃肠的)

　　bleeding with heavy use，and there is research that indicates an increased risk of bleeding­related stroke in people who use it regularly.In some cases，these reactions can be killers.Another potentially deadly problem is aspirin poisoning and most people don't know about it.

　　Before you start taking any of these over­the­counter(不需处方也可出售的)

　　drugs on a long­term basis，it's a good idea to discuss it with your health care provider.

　　【语篇导读】　本文是一篇说明文，介绍了人类最常使用的药物之一——阿司匹林的作用、疗效以及在人们日常生活中的重要作用，同时也提出了它对人体的副作用。

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