来自《耶鲁大学开放课程：资本主义：成功、危机与改革 第6集 第6集》
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The cities grew up initially at the intersection of在港口啊 码头啊这些地方 -
ocean shipping, coastwise shipping, and canals.城市开始发展了 -
They grew up because there was always an economic advantage城市的发展 -
to being at the junction point与其处于运输枢纽的经济优势 -
between the main systems of transportation.是分不开的 -
Rail took this and raised it by many powers.铁路取代并提高了这种优势 -
The American Rail Network, this is a simplified map这是美国的铁路网 -
Rand McNally from 1944,1944年的兰德麦克纳利版简图 -
and it's about passenger rail.这仅仅是客运路线 -
The real density of the U.S. rail network美国铁路网的实际密度 -
is about five times what this suggests.大概是这个的五倍 -
That density created exactly这个密度