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本帖最后由 polosongrui 于 2010-5-22 23:28 编辑
自己的第一次修改
Outline :
1 The survey just includes 25 infants and they are not representative in general.
2 The relation between increased levels of melatonin and signs of mild stress is not clear.
3 The relation between signs of mild stress and shyness is not clear.
4 The arguer fails to rule out other factors that might have caused shyness in the surveyed infants.
In the argument, the arguer concludes that increased levels of melatonin before birth lead to shyness during infancy and the shyness continues into later life. To justify this claim, the arguer provides the evidence from a study of a group of infants who show signs of mild distress when exposed to unfamiliar stimuli and a follow-up study carried 13 years later as well. A careful examination of this argument would reveal how groundless the conclusion is.
Firstly, the study just includes 25 infants and the number is too limited to be representative in general. The quantity of samples is so small that they just can reflect a little part of the possible factors which could contribute to the result. The study should take consideration of other factors such as the place where the infants are born and the age of infants' parents. In order to achieve it, he amount of samples is adequate to an extent and the infants are chosen randomly.Only in this way can the result be convictive.
Secondly, the arguer fails to establish a causal relationship between increased levels of melatonin and signs of mild stress in the infants. There is no evidence to make clear that the situation that infants show signs of mild stress when exposed to unfamiliar stimuli result from increased levels of melatonin directly or indirectly. Besides, the human body contains numerous hormones and changes in levels of other hormones may have the effect.
Even if it is the changes of melatonin that result in the consequence, another problem with this argument is the unfounded causal relationship between signs of mild stress and shyness. The same point is that the 25 infants show signs of mild stress, but they may grow up in different environment and get different education, which may also cause the shyness. Even if all the external factors are same, their parents are different and transfer different genes to them. The formation of shyness could have much to do with the genes.
Finally, the arguer fails to rule out other factors, including the external and the internal, that might have caused shyness in the surveyed infants. Some other evidences are required to demonstrate that the possible factors, such as grow-up circumstance, the education and the genes, which have been referred to above, cannot lead to the same result.
To sum up, the conclusion lacks credibility because the evidence cited in the analysis does not lend strong support to what the arguer maintains. To strengthen the argument, the arguer would have to provide more evidence concerning the factors mentioned above. Only by this can the argument be more convictive.
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第二次自改
In the argument, the arguer concludes that increased levels of melatonin before birth lead to shyness during infancy and the shyness continues into later life. To justify this claim, the arguer provides the evidence from a study of a group of infants who show signs of mild distress when exposed to unfamiliar stimuli and a follow-up study carried 13 years later as well. A careful examination of this argument would reveal how groundless the conclusion is.
Firstly, the study just includes 25 infants and the number is too limited to be representative in general. The quantity of samples is so small that they just can reflect a little part of the possible factors which could contribute to the result. The study should take consideration of other factors such as the place where the infants are born and the age of infants' parents. In order to achieve it, he amount of samples is adequate to an extent and the infants are chosen randomly.Only in this way can the result be convictive.
Secondly, the arguer fails to establish a causal relationship between increased levels of melatonin and signs of mild stress in the infants. There is no evidence to make clear that the situation that infants show signs of mild stress when exposed to unfamiliar stimuli result from increased levels of melatonin directly or indirectly. Besides, the human body contains numerous hormones and changes in levels of other hormones may have the effect.
Even if it is the changes of melatonin that result in the consequence, another problem with this argument is the unfounded causal relationship between signs of mild stress and shyness. The arguer just take it for granted that signs of mild stress equal to shyness. After all, the signs of mild stress can be regarded as intension or fear. The same point is that the 25 infants show signs of mild stress, but they may grow up in different environment and get different education, which may also cause the shyness. Even if all the external factors are same, their parents are different and transfer different genes to them. The formation of shyness could have much to do with the genes.
Finally, the arguer fails to rule out other factors, including the external and the internal, that might have caused shyness in the surveyed infants. Some other evidences are required to demonstrate that the possible factors, such as grow-up circumstance, the education and the genes, which have been referred to above, cannot lead to the same result.
To sum up, the conclusion lacks credibility because the evidence cited in the analysis does not lend strong support to what the arguer maintains. To strengthen the argument, the arguer would have to provide more evidence concerning the factors mentioned above. Only by this can the argument be more convictive.
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