Roga index

例句：

1. 1.The Roga Index is a measure of the health of a country's economy.
   罗加指数是衡量一个国家经济健康状况的指标。
2. 2. The Roga Index has been declining steadily for the past few years.
   罗加指数在过去几年里一直在持续下降。
3. 3.The Roga Index is used by economists to analyze economic trends and forecast future growth.
   经济学家使用罗加指数来分析经济趋势并预测未来增长。