After all, an average runner's feet will hit the ground anywhere from five hundred to one thousand times per foot each mile.

总之，一般人的每只脚每英里就会踏地500至1000次。

So still exhausted after Boston, Obama started off on a sixteen-hundred-mile trip around the state. He visited thirty-nine cities in just five days.

所以从波士顿回来仍旧很疲惫，奥巴马起身在全州开始一个一千六百英里的旅行。

Some twenty five hundred racers spent the night camped out in fields and shelters across the 50-mile course.

约2500名参赛者跑了五十英里后在野外露宿了一夜。