This model accounts for the uncertainty about the loads acting on the wind-turbine rotor blade by the unstable wind distribution. A 20-year design lifetime is considered.

该种模型考虑了由于风速的不稳定所带来的作用在风力机叶片上分布载荷的不确定因素，并假定风力机的设计寿命为20年。

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Using the property of the monotonic degradation of the ship hull strength with time, the minimum value of the ship hull strength in the design lifetime can be easily determined.

利用船体梁强度的单调退化特性，确定在设计寿命内船体强度的最小值。

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So the packing that design method is improved has good economic and social benefit and longer lifetime.

经改进设计的盘根密封性能良好，使用寿命明显延长，具有良好的经济效益和社会效益。

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More than half of Cox's clients are knowledgeable, confident gardeners themselves, who understand that high-end garden design entails a lifetime commitment.

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