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.
关于农业政策，哈金说，农场主们已经历了生产成本的上涨，但目前的商品价格却远远低于作物播种时的价格。
On the farm policy front, Harkin said farmers have had to deal with higher production costs but much lower commodity prices than at planting time.
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