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。

youdao

Mildewy become angry: this kind of question happens in damp paint surface more if lunt condenses in glass and metallic surface constant meeting produces the blotch of palm black.

发霉变色：这种问题多发生在潮湿的油漆表面，如水汽凝聚在玻璃和金属表面时常会产生棕黑色的污斑。

youdao

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。

youdao

When you're falling to the surface of the Earth, you are describing a problem of constant acceleration.

当你讨论下落问题时,你在描述一个加速度恒定的问题

耶鲁公开课 - 基础物理课程节选

Regolith is a fine powder formed by a constant rain of small meteorites that breaks up the rocks at the surface.

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But beneath the surface, there is the CIA officer's constant and often uncharitable assessment of the target's aspirations, fears and desires.

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