There is another way to build a greener jetengine: by bypassing the turbine to an even greater extent, with an open rotor.
还有一种制造更为环保的喷气式发动机的方法采用开式转子使得涡轮有更大的旁通。
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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.