... 测流线 gauge line 铁路轨距 gauge-railroads 高斯 Gauss ...
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Railroads in the United States did not settle on a uniform gauge until the 1880s, making interconnections between lines in the North and South complicated, slow, and expensive.
美国铁路直到十九世纪八十年代才采用统一的轨幅，这就使得南北方铁路间的互连不但非常复杂而且缓慢、昂贵。
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