本文对奥运会志愿者及其志愿活动做了界定并分类，并奥运会志愿活动价值核算的内容和核算方法进行讨论，详细阐述了北京奥运会志愿活动如何进行行业替代分析。
In this paper, the Olympic volunteers and volunteering activities have defined and classified, and the Olympic volunteer accounting value and the methods of the contents of the discussion elaborated.
目前，虽然这似乎还不能够构成眼下或者不远未来中的重要问题，但是我们必须分析思考可以纳入何种替代能源。
Currently, this does not seem like a problem that is relevant now or in the near future, but we must nevertheless analyze how alternative sources of energy may be introduced.
由于通过回归模型未能很好解释死因，混合国际期货系统增加了替代结构模型进行死因分析，并且解释了相似健康危险因素的变化。
The hybrid IFs system adds alternative structural formulations for causes not well served by regression models and accounts for changes in proximate health risk factors.
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