Cyclists take in more black carbon because they breathe faster and deeper than walkers. And they're on the road, closer to exhaust fumes than sidewalk pedestrians are.

骑自行车者比步行者吸入更多黑碳，因为他们呼吸得更快更深。而且，在路上的他们比在人行道上的行人更接近废气。

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And they're on the road, closer to exhaust fumes than sidewalk pedestrians are.

而且，在路上的他们比在人行道上的行人更接近废气。

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The ground plane consists of road textures, sidewalk textures, and green areas such as grass.

地面组包含了道路的材质、人行道的材质和绿化部分例如草地。

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Debris covers the road and sidewalk, buildings are pock-marked with bullet and shrapnel holes, and shredded store awnings flap feebly in the breeze.

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On my first trip, I had successfully ridden about six miles to pick up a DVD when I reached the inevitable: a long stretch of sidewalk-less road.

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