1. Very often such statues were enclosed in rectangular shrines or wall niches whose only opening was at the front, making it natural for the statue to display frontality. 这些雕像通常被封闭在长方形的神龛或壁龛中，它们唯一的开口在前面，这使得雕像很自然地展现了正面。
2. Many zoologists believe that it was because so many ecological niches were available with virtually no competition from existing species. 很多动物学家认为，这是因为，在几乎没有任何现存竞争物种的情况下，有太多的生态小生境可供生存。
3. This fact was of enormous value in helping the national economies find their niches in the evolving currents of the international economy. 这一事实对帮助各国经济在国际经济的演变潮流中找到自己的位置具有巨大的价值。
4. Following each mass extinction, there is a sudden evolutionary burst as new species develop to fill the ecological niches opened by the event. 在每一次物种大灭绝后，都有一次突然的进化爆发，因为会有新物种出现来填补灭绝创造的生态位。
5. The physical structure of species competing for resources in the same ecological niche tends to gradually evolve in ways that allow them to occupy different niches. 争夺同一生态资源的物种趋向于朝着依赖不同资源的方向进化；而相互竞争的物种会逐渐改变他们的活动范围，使其领地不再重叠。
