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1·The circular ground built-up gear hob, designed by combining the superiorities of products from different countries shows its advantages over the integral hob in volume production .

集中各国产品优点设计而成的新型圆磨法装配式滚刀在批量生产中，相对整体滚刀表现出卓越的性能。

2·Several groups of thermal balance equations for a helicopter gear transmission system are built up by thermal network method.

以某直升机齿轮传动系统为研究对象，用热网络法建立了该传动系统的热平衡方程组；