A analysis method of fatigue life reliability for composite structures is developed based on residual strength degradation theory.
以剩余强度衰减理论为基础，建立了一种复合材料结构疲劳寿命可靠性定量分析的工程方法。
Prof Ostrom has challenged the conventional "tragedy of the Commons" theory, arguing that societies and groups regularly devise rules and enforcement mechanisms which stop the degradation of nature.
奥斯特罗姆教授对传统的“公地悲剧”理论发起挑战，她主张，社会和团体经常制定规则和执行机制，遏制自然界的退化。
The second part is the theory analysis that the environment degradation and the green tax revenue.
第二部分是环境退化与绿色税收的理论分析。
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