Manatees are what's known as a " keystone species."

海牛因其“关种”身份而著。

Sharks are keystone species in the world's oceans.

“鲨鱼是世界海洋中的关物种。

So another term for that is Aspen is a keystone species.

换句话说，山杨是关物种。

For example, a science reading might explain what a " keystone species" is.

例如，一篇有关的文章可能解释关物种是什么。

Beavers are considered keystone species, which have an outsized effect on their ecosystem.

海狸被认为是关种，对所处生态系统有重大影响。

Speed restrictions are also effecting on parts of keystone corridors between Harrisburg Pennsylvania and Philadelphia.

速度限制也影响宾夕法尼亚哈里斯堡和费城之间的部分关走廊。

Early on in his tenure as director, he made updating and modernizing the facility a keystone of his work at Hayden.

在他刚任馆长时，更新设备是他的工作重点。

The keystone species such as the rhino will be there for my young ones to appreciate as well.

诸如犀牛这类的关物种会一直保存下来，我们的孩子也能看到它们。

We hope to see you become a keystone of the intellectual community.

我们希望看到你们成为这知识型社区的一块拱顶石。

All these considered approaches to injustice evoke the very keystones on which the internet was built: to network, to have signal, to connect -- all these terms that imply bringing people together, not pushing people apart.

所有这些对抗不公的方法，唤起了互联网建立时的初衷，那就是网络，标榜和连接-- 这寓意着使人们团结，而不是疏远。