她步行回家时，他偷偷地接近然后下手袭击，并且抢劫了她。
He stalked his victim as she walked home, before attacking and robbing her.
原因是城市居民住所通常更接近他们上班购物和娱乐的地方，以至于相比较郊区居民，步行，骑车或乘坐公共交通是更常见的选择。
The reason is that city dwellers generally live closer to the places where they work, shop and play, and are more likely to walk, cycle or use public transport than suburbanites or country folk.
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。
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.
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