At that time, the Andaman Islands were connected to modern-day Myanmar by a land bridge.

当时，安达曼群岛通过一座与今天缅甸相连。

A land bridge - as wide as 1,500 kilometers - joined Asia and North America.

连接亚洲和宽达1500公里。

There's no evidence that there was this huge land bridge across the Atlantic.

没有证据表明，有一座巨横跨西洋。

They migrate across the land bridge into Asia, jump over into Europe.

他们跨过，进入亚洲，然后进入欧洲。

Scientists believe this happened more than 15,000 years ago over the Bering Land Bridge which no longer exists.

科学家认为这种象发生在一万五千年前白令海峡上，而在已经不存在了。

That was a few thousand years before rising sea levels covered the Bering land bridge between Asia and North America.

在那之后几千年，海平面才上升覆盖亚洲和之间白令。

IT CAME WITH THE LAND BRIDGE AND SURVIVED THE CHANGES.

它与一起出并在变化中幸存下来。

So they decided that Indians had reached North America by some unknown land bridge.

因此他们断定印第安人是通过某个未知到达。

And so they control this land bridge.

他们控制着这片。

What happened to the land bridge?

发生了什么？

There was a land bridge between Siberia and Alaska before the end of the last ice age.

在最后一个冰河时代结束之前， 西伯利亚和阿拉斯加之间有一座。

Ancient texts describe how Prince Rama had the land bridge built to reach his wife across the sea.

古代文献描述了拉玛王子如何建造以跨海到达他妻子。

This island -- now known as Wrangel Island -- was once connected to Siberia by land bridges and ice shelves.

这座岛屿——在被称为弗兰格尔岛——曾经通过和冰架与西伯利亚相连。

And about a half-million years after that, they crossed the Bering Strait land bridge to spread into Asia, Europe, and Africa.

约在那之后半百万年里，它们通过白令海峡扩散到了亚洲、欧洲和非洲。

You see this on the map, how the Pacific ocean rose, the land bridges that connected Japan with China first were erased.

你可以在地图上看到， 随着太平洋上升，最初连接日本和中国被淹没了。

Sticking to land during their long migrations brings birds from all over the world together at a few key straits and land bridges along their routes.

在漫长迁徙过程中，世界各地鸟类都会选择在地上迁徙，在迁徙路线上几个关键海峡和上汇集。

Giant beasts, like the wooly mammoth and giant sloth, died off to be replaced by better adapted creatures that migrated across land bridges from the north.

像长毛猛犸象和巨型树懒这样巨动物都灭绝了，取而代之是适应力更好生物，它们从部通过迁徙而来。

Some geologists believe that it was once a naturally-occurring land bridge which either collapsed into the sea or was engulfed by rising sea levels.

一些地质学家认为，它曾经是一座天然存在，要么坍塌入海，要么被上升海平面吞没。

Which is weird, because scientists think that the land bridge between North and South America probably wasn't complete until about 3 million years ago.

这很奇怪，因为科学家认为连接洲和南洲可能直到约300万年前才完全形成。

Soon maps of prehistoric seas were almost solid with hypothesized land bridges, from North America to Europe, from Brazil to Africa, from Southeast Asia to Australia, from Australia to Antarctica.

过不多久，史前海洋地图上几乎到处都是假想，从洲到欧洲，从巴西到非洲，从东南亚到澳利亚，从澳利亚到南极洲。