例如，某项研究显示，如果在伦敦推广小排放量汽车，可使每百万居民的寿命延长160年，在印度德里为1700年。

For example, switching to low-polluting cars in London and Delhi, India, would save 160 lost years of life in London and nearly 1,700 in Delhi for every million residents, one study found.

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某项研究更是显示，航空旅客染上感冒的风险较一般人高出了20%之多。

One study pegged the increased risk for catching a cold as high as 20%.

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