In essence, the momentum wheels constitute the rotor of a motor, which possesses a high moment of inertia.

动量轮实质上就是电机的转子，它具有很高的转动惯量。

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In this paper an advanced design concept of zero-bias momentum 3-axes attitude control system consisting of four skew reaction wheels is presented.

本文提出一个与常规不同的零动量——偏置动量三轴姿态控制系统的设计方案。该系统由四个斜装的反作用轮组成。

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Mattel built momentum in a number of key brands, including Barbie, American Girl, Hot Wheels and Batman: Dark Knight, says CEO Bryan Stockton.

FORBES: Mattel Sees Brightened Profits from Batman, Barbie

The wheels, nearly 3 inches in diameter, facilitate more efficient coasting once you've built up momentum, and better absorb bumps in the road.

WSJ: More Skateboard, Less Falling Off