由于劳动力是他们最大的成本之一——平均占美国农场生产成本的42%——他们开始使用机械收割。

With labour one of their biggest costs—42 percent of production expenses on U.S. farms, on average—they started using a mechanical harvest.

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由于劳动力成本是他们最大的成本之一——平均占美国农场生产费用的42%——他们开始使用一种由酿酒商使用的机器改装而成的机械收割机。

With labour one of their biggest costs—42 percent of production expenses on U.S. farms, on average—they started using a mechanical harvester adapted from a machine used by wine makers.

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美国农业部和加州大学戴维斯分校的菲利普·马丁研究了机械化趋势，以预测美国农场的发展状况。

Department of Agriculture, and Philip Martin at the University of California, Davis, have studied trends in mechanization to predict how US farms might fare.

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What percentage of Americans do you think worked on farms at the end of the nineteenth century?

你们认为在十九世纪末,大概有百分之多少的美国人在农场工作

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