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1. The Thames is spanned by many bridges.
    泰晤士河上架设有许多桥。

2. Potholes, unrepaired bridges, and other problems will make streets impassable to motor vehicles, so bicycles and animal-drawn vehicles will prevail.
    坑凹不平的路面、失修的桥梁以及其它问题将使机动车无法在街道上行驶,因此将盛行自行车和畜力车。

3. Concrete pillars for highway bridges that previously only had steel rods inside are now enclosed in steel.
    高架桥的水泥柱先前只是在内部埋设钢条,如今外面也包上了钢板。