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1·They provide marketable products that can be produced by small-scale, household production systems, and are generally of higher value and less vulnerable to critical harvest timing than many crops.

畜牧提供可由小型家庭生产体系生产的可销售产品，总的来说价值比许多作物高，而又不像许多作物那样易受关键收获时间的影响。