Keeping 20 cars free of scratches and dents when steered by drivers unfamiliar with New York City traffic isn't easy either, but no sheet metal was harmed.
当20辆车都由不熟悉纽约市交通的记者们驾驶时，要让所有车都没有划痕和凹陷，也不容易，但所有车辆均毫发无损。
Such grinding wheel has advantages as high grinding ability and high grinding efficiency, but they are easy to induce scratches on the ground surfaces and hence make bad surface machining quality.
这种高刚度的砂轮具有高的磨削能力和磨削效率，缺点是被磨工件表面易产生划痕，难以获得高的表面加工质量。
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