1·Increases in seeds from pioneer plants and systematic changes in the animals hunted are evidence of environmental degradation.
先锋植物种子的增加和被猎杀动物的系统性变化是环境退化的证据。
2·Increases in seeds from pioneer plants and systematic changes in the animals hunted and the trees used for construction and fuel are evidence of environmental degradation.
先锋植物种子的增加，被猎杀的动物以及用于建筑和燃料的树木系统的变化是环境退化的证据。
3·Support for this idea came from the observation that long-lasting climax communities usually have more complex food webs and more species diversity than pioneer communities.
支持这一观点的是，长期存在的顶极群落通常比先锋群落有更复杂的食物网和更多的物种多样性。
4·As time went on, there was a substantial increase in seeds from pioneer plants, attesting both to agricultural intensification and to an increasingly disturbed local environment.
随着时间的推移，“先锋植物”的种子大量增加，这是农业集约化和地方环境日益受到干扰的证据。
5·If there is ever a core or a pioneer group in Europe, Spain will be in it.
如果说欧洲有一个核心或者是先锋集团，那么西班牙将会位列在其中。