马克吐温青年时，美国的地理中心是密西西比河流域，而对于这个新兴国家来说，密西西比河就是其交通大动脉。
The geographic core in Twain's early years, was the great valley of the Mississippi River, main artery of transportation in the young nation's heart.
美国衣阿华州中东部西达河上达文堡西北偏西一城市。是重要的商业、工业和交通运输中心。人口108,751。
A city of east-central Iowa on the Cedar River west-northwest of Davenport. It is a major commercial, industrial, and transportation center. Population, 108,751.
美国衣阿华州中东部西达河上达文堡西北偏西一城市。是重要的商业、工业和交通运输中心。人口08,75。
A city of east-central Iowa on the Cedar River west-northwest of Davenport. It is a major commercial, industrial, and transportation center. Population, 08, 75.
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