... Steady-state 稳定状态；平衡状态 Steel-Wheel Rollers 铁轮压路机 Steep Gradient 陡坡 ...
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The forbidding-looking wheels, made by Timken, do away with tire and rim, instead moving on six pairs of polyurethane-covered steel rollers, each angled at 45 degrees to the wheel itself.
FORBES: Airtrax topples the tyranny of steering.
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