连续五年这儿的庄稼收成都不好。
在过去5年，这些村庄的庄稼收成翻三番。
In the past five years, Sanchez said crop yields in the Millenium Villages have about tripled.
有时我测量灌溉，给撒种的土地施肥，然后跟踪并预测庄稼收成。
Sometimes I measure irrigation and fertilization of a seeded area and follow it up with estimates of crop yield.
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