求翻译：包头因北扼阴山阙口，南得黄河航运之便，历来是沟通北方游牧民族与中原农耕民族之间的交通要冲，又是西北物资集散的一个中心。1850年，黄河渡口移此，停靠船只竞有千艘之众，包头由此成为享誉蒙古高原和西北各省的“水旱码头”。1923年，平绥铁路由归绥（今呼和浩特）向西延伸到了包头，包头商贸愈益繁荣，成为蒙古高原、西北各省同津京之间物流联系的中转地，“水旱码头”更为驰名。是什么意思？

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Because Baotou north clutches Yin error mouth, south the Yellow River shipping then, always is north the communication the nomads and between the area south of Yellow River agriculture nationality's transportation must flush, also is a northwest commodity collection and distribution center.In 1850,

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