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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·As an example, let's look at foraging behavior among beavers.

作为一个例子，让我们看看海狸的觅食行为。

3·Beavers peel off the bark to eat and they also use the branches for building their shelters.

海狸把树皮剥下来吃，它们也用树枝来筑巢。

4·The coyotes killed a large percentage of the park's red foxes, and completely drove away the park's beavers.

土狼杀死了公园里大部分的红狐，还赶走了所有的海狸。

5·Beavers live near streams and rivers and they block up the streams and rivers with like logs and sticks and mud.

海狸住在小溪和河流附近，它们用木头、树枝和泥巴堵住小溪和河流。

6·If water levels fall in summer, as they do in most of North America, then beavers lodge entrances may be exposed.

如果夏季水位下降，就像在北美大部分地区所发生的那样，那么海狸居所入口可能会暴露。

7·If water levels fall in summer, as they do in most of North America, then beavers' lodge entrances may be exposed.

如果像北美大部分地区一样夏季水位下降，那么海狸的小屋入口就会暴露出来。

8·There used to be beavers all over the place, something like 200 million beavers, just in the continental United States.

在美国大陆，到处都有海狸，大约有2亿只海狸。

9·The beavers were hunted a lot, overhunted, they are almost extinct by the 1800s, that meant fewer wetlands, less standing water.

海狸被大量捕杀、过度捕杀，到19世纪它们几乎灭绝了，这意味着湿地和静水变得更少了。

10·These beavers do know how to build dams, and do so if the need arises, as may occur if they are forced to relocate after felling and consuming all nearby trees.

这些海狸知道如何建造水坝，而且在有需要的时候就会这么做，比如当它们在砍伐和消耗了附近所有的树木后被迫迁移的时候。

(1)eager beaver做事非常卖力气的人，做事勤奋的人（特别指做事过于卖力气以讨好上司的人）