Mother trees are a crucial keystone in regeneration of forests.

母树是森林再生的重要石。

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。

So polar bears are an economic keystone in Churchill, driving tourism and creating jobs.

所以北极熊在丘吉尔成了石的一部分，推动旅游业和创造就业机会。

Sharks are keystone species in the world's oceans.

“鲨鱼是世界海洋中的键物种。

So these water towers are keystone to our future.

因此，这些水塔也成为了我们未来的石。

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

海牛因其“键种”身份而著名。

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

换句话说，山杨是键物种。

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

例如，一篇有学的文章可能键物种是什么。

This is biden's second visit to the keystone state this week.

这是拜登本周第二次访问拱心石之州（宾夕法尼亚州的别称）。

What Hawaiian keystone species is currently under threat from a fungal infection?

夏威夷的什么键物种目前正受到真菌感染的威胁？

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

海狸被认为是键种，对所处生态系统有重大影响。

It's a true keystone species, involved in everything that's going on here.

它是真正键的物种，这里发生的一切都与它有。

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键走廊。

That keystone brick to happiness is PROGRESS. The following few moments may very well change your life.

得到幸福的楔石就是进步。接下来几个瞬间可能会改变你的生活。

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

诸如犀牛这类的键物种会一直保存下来，我们的孩子也能看到它们。

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。

Understanding their role as a keystone species helps us bolster efforts to conserve saguaros and other species like them.

了它们作为键物种的作用有助于我们加强保护蜥蜴和其他类似物种的努力。

This makes it a keystone species: a species that plays a disproportionately large role in its ecosystem.

这使它成为一个键物种：一个在其生态系统中扮演着不成比例的重要角色的物种。

He begins by saying that a nurse is the actual keystone of the medical profession.

他首先说护士是医疗行业的石。

Let's listen: A nurse is the actual keystone of the medical profession.

让我们听听：护士是医疗行业的石。