Dual Counter-rotating Rings 双循环计数环
rotating seal rings 转动密封环
rotating rings
旋转环
以上为机器翻译结果，长、整句建议使用 人工翻译 。
One way to increase the efficiency of a high-bypass jet engine is to turn the fan into an open rotor, a bit like returning to propellers, but using two rings of stubby counter-rotating blades.
ECONOMIST: A new way to build a greener jet engine
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