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问题: 这句话怎样正确翻译?

Some blood types are quite common ,others are regionally ditributed , and still others are rare everywhere .
There also is the obvious environmental benefits to biking , since it reduces air pollution and traffic .

解答:

有些血型很常见,其他的则按区域分布,还有一些是到处都罕见的。
骑自行车还有明显的环境效益,因为它降低了空气污染缓解了交通。