简单地改用电动汽车并不意味着城市没有污染。
Simply switching to electric cars will not mean pollution-free cities.
城市高温，在加重居民生活用电花费的同时，也埋下了安全隐患。 所以，这也就不难解释为什么纽约人想把黑色的屋顶刷成白色。
The costs and dangers of hot cities are why, to paraphrase the Rolling Stones, the New Yorkers see a black roof and they want it painted white.
在像巴尔的摩这样的城市，有30%的人没有家用电脑在线访问，我们建立了一种新的职责。
In a city like Baltimore, where 30 percent of the population has no home computer access, we have found a new role.
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