平直的混凝土跑道将卫星雷达信号向远离卫星的方向发射开去，所以在图像中表现为两条深黑色的直线。
The two runways are clearly visible as black lines, because the flat concrete reflects radar signals away from the TanDEM-X satellite.
在第三个英里的时候(也许那是我的努力，本可能是我…)足球场变成了仅仅的那样一个场子，跑道仅仅是1条红色混凝土的带子，看台开始空得像出鬼一样。
In the third mile-maybe it was the exertion, could have been the rhythm of my footfalls-the field became just a field, the track just a ribbon of red clay, and the bleachers began to empty of ghosts.
应用该规律，可以预估旧有混凝土路面和飞机场跑道的剩余寿命。
This formula could be used to predict the remaining life of existing concrete pavements and airport runways.
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