以下为句子列表：
英文: Calculation results illustrate that decreasing the blade hub-to-shroud loading level can increase the impeller adiabatic efficiency, and that aft-loaded impeller can obtain higher impeller adiabatic efficiency.
中文: 计算结果表明，在一定范围内，降低叶片轮缘－轮毂方向的负荷可以提高叶轮效率，后加载方式可以改善离心压气机叶轮性能。
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