Many railways painted a white mark over the wheel tyre and hub so that any movement of the tyre on the hub was immediately noticeable.

在轮毂和轮箍之间常用白油漆画上记号，只要轮毂和轮箍发生位移，立刻就会被发现。

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To control a wheel mobile robot, a plane eddy sensor which is used to detect road-mark is developed.

为了控制轮式移动机器人的行走，研制了一种平面涡流式轨道检测用传感器。

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To control a wheel mobile robot, a plane eddy sensor which is used to detect road-mark is developed. it's construction, working principle and experimental results are reported.

为了控制轮式移动机器人的行走，研制了一种平面涡流式轨道检测用传感器。并介绍了该传感器的构造、工作原理及实验结果。

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Car rental agencies report that a secondary market has developed, with American officers subletting four-wheel-drive vehicles at a 50% mark-up.

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Officials from the National Transportation Safety Board have said they are examining the broken section of rail and the "witness mark" it left on one wheel of the first train.

WSJ: Metro-North Is Set To Restore Full Service Wednesday

From fire and the wheel down to the light bulb and the iPad, we mark the march of history by the steady beat of transformative innovations.

FORBES: By James L. McQuivey