185.Near Chicago a newly built hydroponic spinach “factuory,” a completely controlled environment for growing spinach, produces on 1 acre of floor space what it takes 100 acres of fields to produce. Expenses, especially for electricity, are high, however, and the spinach produced costs about four times as much as washed California field spinach, the spinach commonly sold throughout the United States. 请问黄色部分是什么意思？
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发表于 2006-4-29 00:52:00
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