pp test one --------reading (12-22)

Since Canadian

metropolitan areas have only one-

quarter the number of kilometers of superhighways

per capita as United States metropolitan areas ---and

at least as much resistance to constructing more --

suburbanization of peoples and functions is less

extensive north of the border than south.

请问这句话什么意思？如何翻译？谢谢指点！！

感谢感谢！！