本文采用综合特征指标的选择方法，筛选出美国无芒雀麦等三个优良能源草种，并提出建立永续性多年生混播草地模式。

Selected the way of multiple character index, we selected Ameri- can Bromus inermis and other two fine energy-herbs and advanced the model of constructing endurable, perennial and mixed meadow.

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我们还将考虑利用指标来衡量和跟踪永续性。

We will also consider the use of indicators to measure and track sustainability.

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利用其公布的1999-2002年连续四年的年报，本文分别计算了衡量各公司多元化程度的赫芬达尔指数，并与一系列衡量企业经营绩效的指标建立回归模型。

Using these annual reports of sample companies from 1999 to 2002, we have built a statistic model to examine the impact of diversification to the firm performance.

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