So, just to get you used to this idea, I'm going to draw a level surface of a function of three variables OK, so it's a surface given by the equation w of x, y, z equals some constant c.
为了令你们习惯于这个想法，我画一个三变量函数的等值面,这是一个平面,由函数w=c给出的。
The surface area of aggregate per unit volume of mortar does have influence on the mean value of the nearest surface spacing, but the ratio between them is not constant.
单位砂浆体积下集料的表面积的变化对邻近集料表面最近间距的平均值有影响，但二者之间的比值并非常数。
Based on this foundation, basic models of plow-bottom surface are ruled surface and negative constant curvature surface.
据此得出直纹和负常曲率两类曲面可作为犁体曲面的基本模型。
This paper is to display existence and its conditions to a surface acoustic wave propogating along surface of a half-body of piezoelectric ceramics with a rotation of constant angular velocity.
对转动半无限压电陶瓷体的表面声波给出了存在性证明及其条件。
The color of certain object surface has a constant feature, irrelevant to the object surface shape. But the color of the image is variablebecause of the existence of highlights.
某种材料表面的颜色具有与形状无关的稳定特性，但图象中表面的颜色由于存在高光和影调而是变化的。
It is shown by the diagnosis of tin surface layer that the dielectric constant in the tin surface layer is larger than that inside the float glass.
渗锡层诊断证明：渗锡层的介电常数大于浮法玻璃内部的介电常数。
It is shown by the diagnosis of tin surface layer that the dielectric constant in the tin surface layer is larger than that inside the float glass.
渗锡层诊断证明：渗锡层的介电常数大于浮法玻璃内部的介电常数。
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