Helps to optimize the entire structure of the site for a crawler by providing an alternate set of Web pages so that crawlers can quickly access and index a large number of embedded pages.

有助于为爬网程序优化站点的整个结构，通过提供备用的We b页面组，从而使爬网程序能够快速地访问大量的嵌入式页面并针对这些页面建立索引。

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Taking a tax model, this paper introduces model identification and parameter estimation of 2sls against alternate interdependence in multi-index econometric model.

本文以税收等多指标模型为例，对多指标经济模型中的交互影响问题，介绍了模型识别、二阶段参数估计等处理方法及应用。

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Another method is to swap the total return on the NCREIF index broken down by property sector, allowing investors to take a position in an alternate property sector in which they may not own properties, thus allowing investors to swap the returns from office related real estate for retail real estate.

FORBES: A Guide To Real Estate Derivatives