"The greatness of individuals can be decided only by those who live after them, not by their contemporaries."
個體的偉大只能由他/她的后人來評判，而不能由他/她同時代的人來評判。
Argument：
The following is a letter to the editor of an environmental magazine.
"Two studies of amphibians in Xanadu National Park confirm a significant decline in the numbers of amphibians. In 1975 there were seven species of amphibians in the park, and there were abundant numbers of each species. However, in 2002 only four species of amphibians were observed in the park, and the numbers of each species were drastically reduced. One proposed explanation is that the decline was caused by the introduction of trout into the park's waters, which began in 1975. (Trout are known to eat amphibian eggs.)"
在X國家公園對于兩棲動物所進行的兩次研究證實了兩棲動物數量的急劇下降。1975年公園中有7種兩棲動物，每種的數量都很豐富。 然而到了202年在公園中只觀察到4種兩棲動物，并且每種動物的數量都顯著下降。一種解釋就是兩棲動物數量的下降曾被歸因于始于1975年的在公園水域引入鮭魚的行為(鮭魚捕食兩棲動物的卵)。
Write a response in which you discuss one or more alternative explanations that could rival the proposed explanation and explain how your explanation(s) can plausibly account for the facts presented in the argument.
