On a hot day in New York, locals sprawl out on the grass fields of Central Park, not on asphalt parking lots or concrete sidewalks. Bricks, concrete, and asphalt – the building blocks from which cities are made – absorb much more heat from the sun than vegetation does in the countryside.
这一点很容易理解。在纽约的一个大热天里，当地人躺在中央公园的绿地上，而不是沥青地面的停车场或混凝土路面的人行道上。砖头、混凝土和沥青这些建造城市的材料比农村的植被从太阳那儿吸收了更多的热量。