With the theory of kinematics, the universal model of changed Angle and variable pitch spiral groove on any turning surface is researched.

本文应用运动学理论，研究了任意回转体外表面上的变倾角变导程螺旋线的通用模型。

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Sunlight reflecting off the surface of the water is turning the water's surface silver in the lower left corner.

在图的左下方，从水面反射的阳光使这部分海水表面显现银色。

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The surface of the world's ocean is slowly turning to acid as our extra carbon pollution dissolves in seawater.

由于我们额外的碳污染物在海水中溶解，全世界的海洋表面正逐渐变酸。

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This reality forced Microsoft to come up with its own magnesium chassis, highly compressed touch-stack for the screen, and a host of other patents and innovations to hit 1.5 pounds with all-day battery life, while not turning the Surface into a heavy, bulky device.

CNN: Microsoft Surface tablet goes on sale for $499

To create the point-contact transistor, Shockley's team modified the cat's whisker by placing two fine metal wires close together on the surface of a germanium crystal, turning it from a diode into a triode.

ECONOMIST: The middle age of the transistor