local ecosystem

As there are abundant water resources near the ski resorts and the melted snow will be recycled, the bid says, snow-making during the Games will not have any negative impact on the local ecosystem.

由于滑雪场附近拥有丰富的水资源，融化的雪水也会被循环利用，申办材料中写道，在奥运会期间进行造雪，不会对当地生态系统造成任何负面影响。

Their reintroduction to Yellowstone National Park has had a beneficial and stabilizing effect on the local ecosystem, particularly where scavengers during the winter months are concerned.

然而，狼的数量也是从那时开始增加的——狼被重新引进到了黄石公园。狼的引进促进了当地的生态平衡与稳定，为环境带来了积极的影响，尤其被食腐动物所欢迎。

Fishery authorities said the banned foreign species was brought to China by criminal gangs for sale as ornamental tropical fish, but somehow escaped to become part of the local ecosystem.

渔政部门透露，这种被禁进口的外来物种最早是作为热带观赏鱼被不法人士引入国内的，随后它们得以逃脱，并成为当地生态系统的一部分。