各产品指数从四月到八月都陆续调低了边际产值。
Indexes of production from April to August were each revised lower by marginal amounts.
第一，这两个指数在计算单项产品的价格变化时套用了不同的平均值公式。
First and foremost, the two indices use different averaging formulae when calculating price changes for each individual item.
中美洲天气风险管理计划提供指数型作物保险产品，由危地马拉、洪都拉斯和尼加拉瓜三国共同制定。
The Central American Weather Risk Management Program, which offers index-based crop insurance products, has been developed in Guatemala, Honduras and Nicaragua.
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