Engine failures that cause high-speed rotating parts to puncture or sever engine coverings aren't supposed to happen on modern jetliners.
据信,高速旋转的飞机部件刺穿或切断引擎罩的事故不会发生在现代喷气飞机上。
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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.
COAXIAL shaft, Two shafts rotating one inside the other for rotating the low and high pressure compressors by the low and high pressure engine turbines.