main reducer的用法和样例：
例句
- The forced vibration problems of a turboshaft engine, which is mounted directly on the main gear box, were investigated.
摘要涡轴发动机的一种常见的安装方式是其主安装节直接与主减速器相连，对这种安装形式下涡轴发动机的受迫振动问题进行了研究。 - The fatigue fracture reason of the weld seam at the back supporting rod of the main reductor of an aircraft has been analyzed by fractography and metallographic test.
对某飞机主减速器后撑杆焊缝疲劳断裂原因作了分析。
