精选优质文档-倾情为你奉上2010年考研英语翻译原文： One basic weakness in a conservation system based wholly one economic motives is that most members of the land community have no economic value. Yet these ereatures are members of the biotic community and, if its stability depends on its integrity, they are entitled to continuance. When one of these noneconomic categories is threatened and, if we happen to love it, we invent excuses to give it economic importance.At the beginning of century songbirds were
