Above all, speak up if you are having any technical difficulty.
最重要的是,如果你有任何技术困难, 就得大胆地说出来.
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The technical difficulty is accurately controlling the low - pressure rotor speed through adjusting nozzle throat area.
技术难点在于通过调节喷管喉道面积,精确控制发动机低压转子转速.
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