英语翻译:mMoondwellers will be able to fly in space atonly three per cent of the cost ofsimilar journeys by their terrestrial cousins.这句话里最后那个 by 是什么作用 ?为何用by,其它介词能用吗?
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![英语翻译:mMoondwellers will be able to fly in space atonly three per cent of the cost ofsimilar journeys by their terrestrial cousins.这句话里最后那个 by 是什么作用 ?为何用by,其它介词能用吗?](/uploads/image/z/4300321-49-1.jpg?t=%E8%8B%B1%E8%AF%AD%E7%BF%BB%E8%AF%91%EF%BC%9AmMoondwellers+will+be+able+to+fly+in+space+atonly+three+per+cent+of+the+cost+ofsimilar+journeys+by+their++terrestrial+cousins.%E8%BF%99%E5%8F%A5%E8%AF%9D%E9%87%8C%E6%9C%80%E5%90%8E%E9%82%A3%E4%B8%AA+by+%E6%98%AF%E4%BB%80%E4%B9%88%E4%BD%9C%E7%94%A8+%3F%E4%B8%BA%E4%BD%95%E7%94%A8by%2C%E5%85%B6%E5%AE%83%E4%BB%8B%E8%AF%8D%E8%83%BD%E7%94%A8%E5%90%97%3F)
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