在克拉科夫，很多污染物来自家庭或工厂的煤燃烧，而在纽约市，小汽车，卡车和巴士的尾气排放是主要来源。
In Krakow, most of the compounds come from coal burning for home heating and factories, while in New York City, exhaust from cars, trucks and buses is the major source.
根据一份最近的可靠数据，纽约市每年平均1000名少女中有77人怀孕，而在整个美国，这个比例是每1000名中70人。
There are 77 pregnancies a year per 1, 000 teenage girls in New York, according to the latest available figures, compared to 70 per 1, 000 teenage girls around the United States.
根据一份最近的可靠数据，纽约市每年平均1000名少女中有77人怀孕，而在整个美国，这个比例是每1000名中70人。
There are 77 pregnancies a year per 1, 000 teenage girls in New York, according to the latest available figures, compared to 70 per 1, 000 teenage girls around the United States.
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