The coils are then housed in an outer rim that encloses the rotating blades.

线圈被放在置于外部的一个框中，而这个框又是把旋转叶片包在中间。

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A number of designs use two rings of stubby, counter-rotating blades made from composite materials.

有许多设计采用了两圈短而粗的、反向对转的采用复合材料制作的叶片。

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In this paper we use Newtoh's method to solve the equation of motion of particles along rotating blades.

本文采用牛顿法并藉计算机求解质点沿机械抛掷机构内的旋转叶片运动的方程。

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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.

ECONOMIST: A new way to build a greener jet engine

Both blacks and whites would do better focusing their energy on defeating the 21st century foes of black equality in education, wealth and housing rather than tilting at windmills, whose blades stop rotating 141 years ago.

NPR: Living in the Present Means Taking Focus off Past