Whereas purposeful men could make their way across a narrow bridge, the slow diffusion of plant and animals would require an avenue as a continent and available for ages at a stretch.

有目的的人可以通过一座狭窄的桥，而植物和动物的缓慢扩散则需要一条像大陆一样的道路，而且需要很长时间才能使用。

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Kennedy missed the main road and, driving at speed down a narrow dirt track, ran off a narrow bridge.

肯尼迪错过了主干道，飞快地冲下一条狭窄的泥土路，冲出一条窄桥。

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The physicists give a simplified example of how this can happen: trying toreach a destination either by using a short but narrow bridge or a longer butwide motorway.

这些物理学家给出了一个发生这种事的简单例证：有两条到达目的地的路，一条路是一座短而窄的桥，而另一条是长而宽阔的高速路。

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We slither down a steep hill and I see the narrow bridge of tree trunks down in the valley ahead of me with some trepidation.

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The ability to connect the phone to your HD TV also helps to narrow the bridge between mobile and console gaming.

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The lighthouse stands on a rugged tall cliff, connected to the mainland by a narrow steel suspension bridge.

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