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谢谢waidsw和sibslcc,辛苦了哦,改了之后好多啦
In this argument, the author claims that the new use of salicylates will continue to decrease the number of headaches steadily. To substantiate this claim, the author points out that salicylates belong to the same family as aspirin and cites a tenty-year study to show that a rise in the commercial use of salicylates as food additives correlated with a steady decline in the average number of headaches reported by participants in the past decades.The line of reasoning is vulnerable in several aspects.
The threshold presumption is that the salicylates help to ease or treat headaches, which the author shows no rigid and reliable scientific evidence to prove. Though the salicylate is a member of the same chemical family as aspirin, it only demonstrates that the salicylate and aspirin share a similar chemical structure. Well, similar structure doesn’t guarantee the same chemical function. Actually, when the salicylate is mixed up with other chemical materials serving as flavor additives, it probably loses effect or even worse funtions adversely.So the argument here is not unquestioning with an unwarranted assumption posed..
Secondly, the author takes it for granted that the use of the salicylates in food directly results in the decline of headaches according to a twenty-year study, which is presumptuous. To start with, the study lacks information to assure that it's the salicylate, rather than other chemicals in additives which have a good chance, that have a correlation with the decline of number of headaches. Furthermore, concerning about the statistical credibility of the study, the author fails to exclude the cases that some patients having a headache didn’t report to the study. What's worse, the author unfairly ignores other factors that may contribute to the ease of headaches, such as developed medical technology, improved quality of surrounding environment or healthier living habits. In short, simply in terms of the study mentioned by author, it doesn't suffice to conclude a causal relationship between the salicylates and the steady decline of headaches.
On a groundless assumption and opionated deduction as above, the author easily concludes that in the future with a new use for salicylates, the steady decline of number of headaches in the average citizen in Mentia is expected. However, the sophistication of human body function is simplified. There are many other potencial causes that can damage health and aggravate the headaches, for instance, suddenly increased work stress or unhealthy living style and so on. Without excluding all other possibilities, we cannot get to the conclusion as the author claims. Last not the least, ususlly things will develop in the opposite direction when they become extreme; assuming the salicylate is beneficial for treatment of headaches, is it the more the better? The author presents no explanations.
All in all, the author commits a false analogy and forecasts a opinionated conclusion on a flawed assumption. In addition, many other important factors that affect human bodies are filtered by the author. So in order to convince others, more solid proofs need to be provided.
[ 本帖最后由 luyaoxu 于 2009-1-16 22:36 编辑 ] |
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