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Laying New Concrete

机译：铺设新混凝土

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Looking down on Heathrow Airport from its 87-meter-high (285-ft.) air traffic control tower, the challenges that face the world's busiest two-runway airport suddenly become very clear. With an aircraft landing or taking off approximately every 2 min., runway and parking-stand capacity is at a premium, and the site offers little room for expansion. On every side, the airport is hemmed in by development, which has a dramatic effect on airport efficiency. A single day of inclement weather can bring about a domino effect on operations resulting in hundreds of canceled flights, leaving passengers stranded and the airport's reputation in tatters. No wonder managers are considering moving operations to another site.
机译：从高87米（285英尺）的空中交通管制塔楼俯瞰希思罗机场，面对世界上最繁忙的两跑道机场的挑战突然变得非常明显。当飞机大约每2分钟降落或起飞一次时，跑道和停车位的容量非常宝贵，而且该场地几乎没有扩展空间。在各个方面，机场都受到发展的束缚，这对机场效率产生了巨大影响。恶劣天气的一天可能会对运营产生多米诺骨牌效应，导致数百次航班取消，使旅客滞留，并使机场声誉受损。难怪经理们正在考虑将运营转移到另一个站点。

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