The rolling tests prove that this setup model can control precisely the displacement of the lapped area in the tooth surface and keep the even backlash.

利用轮齿接触分析与齿轮啮合原理，建立了齿面均匀研磨与定点研磨控制的几何运动模型，经滚检检验，该模型能对齿面研磨位置与侧隙进行较准确的控制。

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Recently the aspheric surface's machining is a difficult problem, so a new method was proposed that aspheric surface workpiece was high speed lapped using lapping tool made by means of bending.

针对目前非球面加工的难题，提出了一种利用弯曲成形法制作磨具来实现非球面高效研磨的新方法。

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The morning haze had burned off, and in the noon light the brackish water appeared deceptively lovely, its surface undisturbed except for a single Jet Ski carving a white wake whose exhausted wavelets lapped at the riprap at the side of the road.

NPR: In 'Challenger Park,' Mom Is an Astronaut