The main shaft between the air compressor and the gas turbine in a jet aircraft engine is hollow to permit an internal speed reduction shaft with the minimum requirement of space and weight.
在喷气式飞机发动机内位于空气压缩和燃气涡轮之间的主轴是空心的，允许有一个需要最小空间和重量的内部减速轴。
Aerospace and Gas Turbines: jet engine components, turbine blades.
航空及燃气轮机：喷气机引擎组件，涡轮叶片。
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