今天的牛津是一个繁忙的大城市，但市中心的古老大学建筑在很大程度上没有受到城市扩张的影响。
Today Oxford is a large, busy city, but the ancient university buildings in the centre have remained largely untouched by the urban expansion.
我们的家在历史城市黎巴嫩贝鲁特的中心附近，是一个中东的大城市。
Our home is near the historic city center of Beirut, Lebanon, a large city in the Middle East.
他们说，在繁华大城市的中心，人群和过往车辆可提供足够的能量为整个城镇的街道照明或者为一个医院或学校提供供暖系统的动力。
They say the human and wheeled traffic in a busy city center could provide enough energy to light the streets of an entire town or power the heating system for a hospital or school.
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