债券的收益在经济循环周期中某些区域随股票市盈率同步移动，在其他区域则不随股票市盈率移动。
Bonds may move in sync with equities at some parts of the economic cycle but not at others.
生命周期分析是循环经济及产业生态学分析的重要方法。
Life cycle analysis is the most important analysis method of circular economy and industrial ecology.
介绍了产品全生命周期和循环经济的概念，提出了产品的资源循环模型。
After the concepts introduction of product life cycle and circular economy, a resource circulation model is presented in this paper.
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