VOA慢速英语2012.05.31 农场, 传统, produced, average, percent

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On average, organic farms produced twenty-five percent less compared to conventional farms. But yields of organic fruits and other perennial crops nearly equaled the yields from conventional ones. So did the yields of legumes such as soybeans. Legumes produce some of their own nitrogen fertilizer.平均而言，有机农场比传统农场产量低25%。但有机水果和其它多年生作物的产量几乎等同于传统产量。黄豆一类的豆科植物产量也是如此。豆科植物能够自己产生一些所需的氮肥。
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