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1·How about beavers—ecosystems with beavers in waterways.

海狸怎么样——水道中包含海狸的生态系统。

2·Once the fire is out, the grass and shrub ecosystems should return quickly.

火一旦被熄灭，草和灌木的生态系统就会很快恢复。

3·At one time, ecologists believed that species diversity made ecosystems stable.

生态学家曾一度认为，物种多样性使生态系统变得稳定。

4·Species that invade a territory can harm ecosystems, agriculture and human health.

入侵一个地区的物种会危害生态系统、农业和人类健康。

5·Exotic insect pests can produce both short-and long-term effects on forest ecosystems.

外来害虫可以对森林生态系统产生短期和长期的影响。

6·Gleason's arguments against climax and biome are largely valid against ecosystems as well.

在很大程度上，格里森反对顶级群落和生物群系的论点用来反驳生态系统同样很有效。

7·Ecosystems free of species defined as exotic are, by default, considered the most natural.

默认情况下，没有外来物种的生态系统被认为是最自然的生态系统。

8·Ecologists concluded that the apparent stability of climax ecosystems depended on their complexity.

生态学家认为，顶极生态系统呈现出的稳定性取决于其复杂程度。

9·Coral reefs are one of the most fragile, biologically complex, and diverse marine ecosystems on Earth.

珊瑚礁是地球上最脆弱、生态性最复杂、最多样化的海洋生态系统之一。

10·Finally, the conference established the framework for a European research network on forest ecosystems.

最后，会议为欧洲森林生态系统研究网建立了框架。

(1)marine ecosystems海洋生态系统