Howe says his publisher determined the date because the next book in the Oxford series starts in 1848.
豪说,出版商要求他写到1848年的美国为止,因为牛津这个系列的丛书下一册是始于1848年。
Howe says steamboats and rail lines linked growing cities that offered opportunities for talented young people.
豪称轮船和铁路线连接了成长中的城市,给那些有才能的年轻人提供了机会。
There is no reason why multiple units could not be connected together to store much more power, Howe says several gigawatt hours.
当提及数千兆瓦时,豪反问,为什么不能将多个机组串联起来,存贮更多的能量。
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