在美国的大城市里，大多数都有很齐全的公共交通系统。
The public transportation systems in most big cities in America are very good.
这座城市必须改善其公共交通系统。
公共交通系统是城市交通规划中一个很重要的子系统。
The system of public traffic is an important subsystem in city traffic programming.
公共交通系统是城市交通规划中一个很重要的子系统。
The system of public traffic is an important subsystem in city traffic programming.
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