协助修建桥梁和码头的水下地基。

They help build under-water foundations for Bridges and piers.

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我们什么时候开始修建桥梁是个问题。

It's a question when we should start the construction of the bridge.

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由于河流特别是在城市附近河段大量修建桥梁，出现一系列重大水力学问题值得引起重视。

Because a large quantity of bridge was built in the river nearby the city, appearing series important hydraulics problems that deserve to pay much attention.

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Built bridges and roads and automobiles, so we can get from one place to another relatively quickly because of that.

桥梁和道路的修建以及汽车的出现,使我们能够快速地,从一个地方到另一个地方

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