A good core index excludes this noise, leaving only the enduring part of inflation that reflects the weight of spending in the economy.

而一个良好的核心通胀指标排除了这一噪音，只留下通货膨胀中可以反映经济中花费权重的持续存在的这一部分。

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Then there's increasing the number of rotor blades. This helps because each additional blade carries less of the weight of the helicopter, and thus produces less noise.

增加旋翼桨叶数量也是一种方法，这使得每片桨叶负载的直升机重量降低了，因此产生的噪音更小。

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Small size, light weight, low noise, simple structure, easy maintenance.

体积小，重量轻、噪声低，结构简单，维修方便。

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Early ideas suggested blunting the nose of the plane to prevent the pressure waves joining up to form one intense shock wave, or lengthening the plane without increasing its weight to dampen the noise.

CNN: Bang goes the sonic boom

The latest model has newly designed, four-blade propellers made of advanced composites that save on weight (60 fewer pounds), reduce noise (inside and out) and lower maintenance costs.

FORBES: The Most Successful Aircraft Design Gets Even Better