美国第一条铁路修建在东部各州。

The first U. S. railroads were built in eastern states.

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他估计这项铁路修建计划要花七年才能完成。

He computed that the railway project would take seven years to complete.

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总的看来，动物能够通过自己的适应和行为调节，可以适应青藏铁路修建对该地区的环境所带来的变化。

Anyway, wildlife could habituate themselves to the changes of surroundings owing to the Qinghai-Tibetan railway building by learning and adjusting their behavior.

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