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人类的交通有不同的方式和层次,每一种都有其长处和短处。各种交通工具的结合,才组成了相互补充的交通网络。因此,没有十全十美的交通工具。
There are different ways and levels of human traffic, each of which has its strengths and weaknesses. The combination of various modes of transport constitutes a complementary traffic network. Therefore, there is no perfect means of transport.