Finally, the writer notes that the decline in the amphibian population has been blamed on the introduction of trout into the park s waters in 1920, but then dismisses that argument on the purely specious basis that it does not explain the worldwide decline. This part of the argument blithely dismisses the very relevant fact that trout are known to eat amphibian eggs. This attempt to prove a negative is the last resort of those in search of some vain attempt to prove the truth of the matter that they are asserting. It is basically impossible to prove a negative this is an attempt to shift the burden of proof back on to the nonbelievers of the argument. The global environmental situation and that of Yosemite National Park are not perfectly correlated, and the fact that the trout may very well be responsible for the decline cannot simply be dismissed without further proof.
In summary, the writer fails to establish any causal relationship between global air and water pollution and the decline of amphibious life worldwide. The evidence presented is extremely weak at best and narrowly focuses on one tiny area of the globe, as well as putting forward as proof two studies about which almost nothing is known. For a stronger argument, the writer would need to directly put forth evidence associating air and water pollution with not only the decline at Yosemite but also throughout other areas of the world.
下述文字摘自一封致某环保杂志编辑的信函:全球两栖动物数量的减少明显标志着全球性水与大气的污染。对加利福尼亚州约塞米蒂国家公园内两栖动物所作的两项研究可证实我的这一结论。1915年公园内有七个物种的两栖动物,每一物种都拥有丰富的种群数量。然而,1992年,在公园内所能观察到的两栖动物物种仅为四类,且每一物种的种群数量已骤然下降。约塞米蒂公园动物数量减少被归咎于始于1920年的将鲑鱼引入公园水域的做法。但鲑鱼的引入不可能成为约塞米蒂公园动物数量减少的真正原因,因为它无法来解释全球范围内的动物数量减少。
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