农业生态系统是复杂的人工生态系统，提高其生产力是农业生产的主要目标。
Agricultural ecosystem is a complicated man-made ecosystem and the increase of its productivity is the main object of agricultural production.
农业生态系统是复杂的人工生态系统，提高其生产力是农业生产的主要目标。
Agricultural ecosystem is a complicated man-made ecosystem and the increase of its productivity is the main object of agricultural production.
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