As a critical part of helicopter, rotor blade anti-fatigue design technique is one of the key to improving safety life and decreasing cost.
作为直升机的关键动部件，桨叶的抗疲劳设计技术是提高桨叶安全寿命，降低桨叶使用成本的关键。
The fifth part is the critical part of the paper, which mainly discussed the suggestions in consummation on legal systems of China's petroleum resources safety.
第五部分是文章的重点，主要探讨了中国石油资源安全法律保障的完善建议。
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