extender index

例句：

1. 1. The company's new productline has a strong extender index.
   该公司的新产品线具有强劲的延伸指数。
2. 2. The research teamfound that the extender index was significantlyhigher than expected.
   研究团队发现，延伸指数明显高于预期。
3. 3. The extender index is usedto measure the effectiveness of a company's marketing strategy.
   延伸指数用于衡量公司营销策略的有效性。