而风力发电，在人口密集的地方毫无价值。
由于蚊子和鸟的作用，该病毒在人口密集的地方传播开来，这样当地人被携带了病毒的蚊子叮咬过后感染该病毒的几率就增大了。
The mosquitoes and birds responsible for West Nile’s spread abound where people also live, raising the odds that a mosquito that picked up the virus feeding on a robin could transmit it to a person.
高铁是减少航空旅行和碳排放的好途径，尤其在象中国这样的地方，它们连接了人口密集但偏远的地区。
They are a good way to cut air travel and carbon emissions, particularly where, as in China, they connect dense but distant population clusters.
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