Portable grinding tools need to be equipped with safety guards to protect workers not only from the moving wheel surface, but also from flying fragments in case of breakage.

便携式研磨工具应装有安全防护装置，这样不仅可防止工人接触运转的砂轮表面，而且他们也不会被破裂时飞溅的碎片击中。

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The experimental results show that the method improves the efficiency and quality of aluminum alloy wheel(aluminum wheel) surface, and verifies the rationality of the force controller.

实验结果表明，该方法有效提高了铝合金汽车轮毂（铝轮）曲面抛光的质量和效率，验证了力控制器设计的合理性。

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Its first grainy, wide-angle images showed its own left rear wheel parked on the surface of Gale Crater near the equator of Mars, close to the foot of a three-mile-high mountain it aims to explore in months to come.

WSJ: NASA's Curiosity Rover Lands on Mars

"They've got a run of asphalt that's coming out of the surface and, also, I did notice at least one pothole in the main wheel track of the road as well, which is surprising for a motorway surface, " Mr Bullock said.

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"For example, even on a road surface with minor ridges or furrows, the driver no longer has to grip the steering wheel tightly and make detailed adjustments, so travelling on the intended path becomes easier, " it said in a statement.

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