然而，由于气密管的建造难度，他们更会建筑跨越山谷的桥梁，而不是从谷底虹吸湖水。

However, due to the difficulty they had in building air-tight pipes it was more effective for them to bridge across valleys than to try to siphon water up from the valley floors.

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桥梁桥梁是跨越如河流、山谷这样障碍的一种建筑，从而提供交通便利，到目前为止，大部分桥梁都是公路桥或铁路桥。

Bridge Bridges that span rivers, valleys such a barrier construction, which provides convenient transportation, so far, most of the Bridges are highway Bridges or railway bridge.

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