Steam also promised to eliminate a transportation problem not fully solved by either canal boats or turnpikes.

蒸汽动力还在试图解决一个运河及高速公路无法完全解决的运输问题。

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Now a main problem of the big city is a transportation problem.

目前大城市中的一个主要问题是交通问题。

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Currently a key problem within big city city is a transportation problem.

目前大城市中的一个主要问题是交通问题。

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The good news is that so-called green transportation is a solution to a problem that is more contrived than real given the global oil boom and the emergence of natural gas, not electric motors, as the major alternative to gasoline and diesel.

FORBES: After Billions Of Taxpayer Dollars, Green Transportation Is A Bust