前面有人讲了，towns and cities是主语。 我又google也一下，发现Wikipedia和大英百科的这个句子很像
urbanization, the process by which large numbers of people become permanently concentrated in relatively small areas, forming cities.
如果直接用by urbanization还是比较顺口的， By urbanization, large numbers of people .....
国家地理也有类似句子，但这里介词用了through
Urbanization is the process through which cities grow, and higher and higher percentages of the population comes to live in the city.
都是互相抄的，呵呵
【 在 McJohn 的大作中提到: 】
: 定语从句的主语是which没错吧？
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