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来源:雅诚德英语网
After decades in which they have not encountered the disease most of the world's wheat varieties have fallen behind in the endless battle of thrust and counter-thrust waged by predators and prey.
这种病害已经有数十年未曾遇到,所以世界上大多数种类的小麦已经在生物圈中捕食及被捕食的进化规则中落了下风。