BEIJING — This city’s network of arterials, five ring roads that are fed by nine more freeways, is barely two decades old, but it is already sclerotic.

环绕北京的五条内环路，修建时间最长的，也不过只有二十年的时间。但因为这五条内环路又通向各自连接的共九条高速公路。

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BEIJING — This city’s network of arterials, five ring roads that are fed by nine more freeways, is barely two decades old, but it is already sclerotic.

环绕北京的五条内环路，修建时间最长的，也不过只有二十年的时间。但因为这五条内环路又通向各自连接的共九条高速公路。

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