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

他们跨过陆桥，进入亚洲，然后进入欧洲。

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

连接亚洲和北的大陆桥宽达1500公里。

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

没有证据表明，有一座巨大的陆桥横跨大西洋。

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

科家认为这种现象发生一万五千年前的白令海峡大陆桥上，而现大陆桥已经不存了。

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大陆桥与今天的缅甸相连。

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

那之后几千年，海平面才上升覆盖亚洲和北之间的白令大陆桥。

Some are fences, some are overland bridges, and some are underpasses.

有的是栅栏，有的是陆桥，有的是地下通道。

IT CAME WITH THE LAND BRIDGE AND SURVIVED THE CHANGES.

它与陆桥一起出现并变化中幸存下来。

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的陆桥到达北的。

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陆桥以跨海到达他的妻子。

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

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陆桥。

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

这个岛——现被称为弗兰格尔岛——曾经通过陆桥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.

大约 50 万年后，他们越过白令海峡陆桥，传播到亚洲、欧洲和非洲。

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.

漫长的迁徙过程中，世界各地的鸟类都会选择陆地上迁徙，迁徙路线上的几个关键海峡和陆桥上汇。

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的巨大动物都灭绝了，取而代之的是适应力更好的生物，它们从北部通过陆桥迁徙而来。

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，因为科家认为北和南之间的陆桥可能直到大约 300 万年前才完工。

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.

一些地质家认为，它曾经是一座天然存的陆桥，要么坍塌入海，要么被上升的海平面吞没。

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，史前海洋的地图上几乎到处都是假想的陆桥，从北洲到欧洲，从巴西到非洲，从东南亚到澳大利亚，从澳大利亚到南极洲。

Even more awkwardly anomalous was another species of trilobite found in Europe and the Pacific Northwest but nowhere in between, which would have required not so much a land bridge as a flyover.

另一种三叶虫的情况更是反常，它出现欧洲和西北部的太平洋沿岸，而中间地带却不见踪影。这与其说需要一座陆桥，不如说需要一座立交桥。

China is also exporting its high-speed rail technology, with projects like the lstanbul-Ankara line and plans for a Trans-Asian network linking China with Europe, part of the Belt and Road Initiative.

中还出口其高铁路技术，如伊斯坦布尔至安卡拉的线路项目，以及计划中的连接中与欧洲的亚欧大陆桥网络，这是“一带一路”倡议的一部分。