The quality of this transition is best visualized by a straight line drawn between two circles: the line's only point of contact with each circle is tangential.

用最明显的图形来描述这个过渡的特性就是：当在两个圆之间绘制一条直线，直线与每个圆只有一个交点时，那么这条线就是两个圆的切线。

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The contact between fluids is usually gradual rather than sharp, forming a transition zone of mixed fluid.

流体间的接触面常常是渐变的而不是突变的，形成一个混合液体的过渡带。

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This paper deals with the technique of laser cladding on contact surface of gears, micro hardness distribution, microstructure and properties of cladding and transition layer.

研究齿轮齿面激光熔覆粉末合金的工艺、显微硬度分布、熔覆层及过渡层等的金相组织及性能。

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They agreed that U.S. and Turkish teams would remain in close contact on ways that Turkey and the United States can work together to promote a democratic transition in Syria.

WHITEHOUSE: The White House