她们沿着平坦的马路行驶时，偶而有马车从她们车旁驶过。

As they drove along the smooth pavement an occasional carriage passed.

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美国大部分的马路是很平坦的。

Most streets in the U. S. are pretty level.

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“平坦对于种植甜菜，饲养母牛，或者建设平直的马路很是方便，但是从运动的观点看那却是一个灾难。”他写道。

"Flat is ideal for growing beetroot, raising cows or building straight roads, but it's a catastrophe from a sports point-of-view," he wrote.

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