以下为句子列表：
英文: According the application and invalidations of the piston, the study of the piston material and the modern configuration design character also including the cooling capacity were illuminated concentratedly for improving the piston durability and life.
中文: 本文根据中重型发动机活塞的使用状况及失效模式，介绍了活塞材料的研究现状、结构设计特点及活塞的冷却技术等，研究提高活塞可靠性和寿命的途径。
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英文: Depending on the function requirement, design character and component importance analysis, the system design is changed into the optimum problem with fewer discrete varieties, and the difficulty of solving large nonlinear scheme is eschewed by using ortho
中文: 根据管网系统的功能要求，设计特点及单元重要性的分析，将系统优化变量转化为较少的离散变量，并利用正交枚举法进行简化计算，从而避免了大规模非线性规划求解的困难。
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