They worked out a whole set of cotton cultivation techniques. 他們研究出了一整套植棉植技術(shù)。
The most remunerative growing has shifted from the traditional southeastern producing region to the irrigated lands of the Southwest. 經(jīng)濟效益最好的植棉業(yè)已從傳統的東南棉區轉移到西南部的大片灌溉地。
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