confirming margin

例句：

1. 1. The company's profit margin has been shrinking due to increased competition.
   由于竞争加剧，公司的利润率一直在下降。
2. 2.The economist believes that the economic growth rate is a confirming margin for the government's fiscal policy.
   这位经济学家认为经济增长率是政府财政政策的验证指标。
3. 3. The new product's market share is a confirmation of its success in the market.
   新产品在市场的份额是其成功的标志。