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1·A likely explanation for this involves the fact that intercontinental migrations require both a land bridge connecting the two continents and the suitable habitat both on and across that land bridge.

对此，有一种可能的解释是，洲际迁移既需要连接两个大陆的大陆桥，也需要大陆桥上和桥对面存在合适的栖息地。

2·With the land bridge now under water…

因为大陆桥现在已经沉如水底…

3·A land bridge links the two continents.

这两块大陆之间有一条陆桥相连。

4·A land bridge that once connected Tunisia and Italy.

昔日连接突尼斯与意大利的陆桥。

5·International Railway Bill can be used in land bridge transport.

国际铁路货运单可以用于大陆桥运输。

6·International Railway Bill can be used in land bridge transport.

国际铁路法案可以用在陆桥运输。

7·The Caribbean once allowed access between Florida and Venezuela, a land bridge.

加勒比曾经允许佛罗里达和委内瑞拉的互通，是个大陆桥。

8·A land bridge as much as 1,500 kilometers wide connected Asia and North America.

一座宽达1千5百公里的大陆桥连接着亚洲和北美洲。

9·It is possible that the first people crossed into Austalia from Asia on a great land bridge.

第一批从亚洲进入澳大利亚的人可能是从一座巨大的陆地桥上过去的。

10·I first came to North American in prehistoric times when I crossed the Bering Strait land bridge from Eurasia.

在史前时期，我从欧亚大陆穿越白令海峡、走过陆地、桥第一次来到了北美。