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So just as longevity might be improving at a fast clip were it not for expanding waistlines, death rates in traffic accidents might show a more positive trend were it not for the SUV explosion.
所以正如如果沒有不斷增長的腰圍,人們的壽命可能會迅速增加一樣，如果沒有 SUV數量的激增，交通事故中的死亡率也許會呈現一個更加良好的趨勢。
The proliferation of cars also encourages us to drive rather than walk. A century ago, the typical American walked three miles a day; now the average is less than a quarter mile a day. Some research suggests that the sedentary lifestyle, rather than weight itself, is the real threat; a chubby person who is physically active will be OK. Studies also show that it is not necessary to do aerobics to get the benefits of exercise; a half-hour a day of brisk walking is sufficient. But more cars, driven more miles, mean less walking.
汽車的激增也促使我們開車而不走路。一個世紀前，一般情況下，美國人每天走3英里，而現在每天平均不到0.25英里。一些研究表明，真正的威脅是久坐不動的生活方式，而不是體重本身；一個愛運動的胖乎乎的牧師是沒有問題的。研究還表明，通過做有氧運動來獲得運動的好處是沒有必要的，每天半小時的快走就足夠了。然而，更多的車，行駛更多英里的路，則意味著步行的減少。
