Firstly, the normal surface error is computed by means of downhill algorithm;
首先利用下山法计算光学镜面在法线方向的变形；
According to the equation of asymptotic curves, a family of nonlinear asymptotic curves are given to the principal normal surface.
根据渐近曲线的方程，具体给出主法线曲面的一族非直线的渐近曲线。
Normal swells, known technically as gravity waves, are created by wind pushing the surface of the sea up and gravity then pulling it down, causing it to bounce.
一般的波浪，技术上被成为重力波，是由于风推动着海洋表面上升而后又在重力的作用下被拉向下方，这便会导致海水的回弹。
Life in Damascus remains normal, on the surface at least.
至少在表面上，大马士革的生活仍属正常。
While on the surface, these discussions are normal given the situation, they can also provide the appropriate occasion for subtext.
尽管表面上，在给定的情形下，这些讨论都是很正常的，但是它们依然可以为潜台词提供合适的机会。
Your body is use to normal walking on a flat surface, thus you don't really get any noticeable results from it.
你的身体习惯于正常走在平坦的表面，这就使你不会真正得到显而易见的效果。
The image shows sea surface height relative to normal ocean conditions for this time of year.
这张图像显示了当前海面与每年此时正常情况下之间的高度差异。
In four locations where a sunspot was soon to emerge, acoustic waves returned to the solar surface with anomalous rapidity-more than a dozen seconds faster than normal.
在有黑子将要浮现的四个地方，返回到太阳表面的声波异常迅速- - -比正常情形快了至少十二秒。
Here the normal map is applied to the low-detail model, and you can see how each channel encodes the surface information along each axis.
下图演示了将法线贴图附加在低分模型上，这里你可以看见各个分量分别为表面添加了那些附加的信息。
Let's break the name down. The "normal" is a vector perpendicular to a surface, which we can use to calculate lighting.
首先我们从名字上开始分析，所谓“法线”指的是垂直于平面的向量，我们使用这个来计算光照。
At the same time, the surface slick is blocking sunlight needed to sustain plant-like phytoplankton, which under normal circumstances would be at the base of the food web.
同时海面上漂浮的原油会阻挡阳光进入海面以下，而这正是浮游生物生存的能量来源，藻类也是正常情况下海洋食物链的食物来源。
Besides the normal states of surface liquid, vapor, or ice, much water exists locked in rock hundreds of miles deep in Earth's mantle.
除了表面覆盖的江湖海水，水蒸气、冰，大部分水可能被锁在地球的地幔深处。
And, in terms of direction, it will be normal to the surface.
对于方向，则是曲面的法方向。
OK, and that's going to be the normal vector to the surface or to the tangent plane.
这就是切平面的，或者说这个曲面的法向量。
And the way it will work is that you have to choose an orientation of a surface, which just means choosing one of the two possible unit normal vectors.
具体方法是，先给曲面定向，也就是选择两个单位法向量中的一个。
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
The above-normal sea surface temperatures are maintained by gentle but giant waves of warm water that slosh across the Pacific from Indonesia toward South America.
由暖水形成的并不算汹涌的巨浪从印度尼西亚横跨太平洋涌向南美，维持着高于正常值的海面温度。
Here we don't have a notion of orienting the surface other than by precisely choosing one of the two possible normal vectors.
这里我们并没有曲面定向的概念，能做的就是，从两个法向量中选出一个作为正方向。
You will get some sort of mesh grid on your surface and you will look at a little parallelogram that is an elementary piece of that mesh and figure out what is its area and normal vector.
在曲面上做一些网格，你会看到一个网上的每一小块儿，都是小的平行四边形，我们要弄清楚它的面积和法向量是什么。
Well, the question we have now is what is the area of this little piece of surface and what is its normal vector?
现在的问题是，曲面上这一小块儿的面积是什么，及其法向量是什么？
Ok, if we look at it near here, if we walk along this way, the surface is to our right.so, we should actually be flipping things upside down. The normal vector should be going down.
我们看看这里，如果我们沿着这条路走，曲面就在我们的右边，我们应该是把它颠倒一下，这个法向量也应该向下。
You can remember, if it helps you, that if a surface is to your right then the normal vector will go down.
你也可以这样记，如果曲面在你的右边,那么法向量就向下。
The convention in the divergence theorem is that we orient the surface with a normal vector pointing always outwards.
在散度定理中的约定是,将曲面的定向取为外法线的方向。
All right, it has the same normal vector as the surface.
它和曲面有相同的法向量。
To find the surface element together with a normal vector, I would just take the cross-product between these guys.
为了找到带法向量的面元，我就取这两个的叉积。
These are slightly raised and thickened with a harder surface than the normal tissue.
这些都是略有提高，增厚，与强硬的表面比正常组织。
Moisture will cause the surface resistivity measurements to be lower than normal.
湿度将使表面电阻率的测量结果比正常情况低一些。
So, remember, when we set up the divergence theorem, we need the normal vectors to point out of our region, which means that on the top surface, n But, on the bottom face, we want n pointing down.
当我们建立散度定理时，我们要使法向量指向区域外，即在上表面时，要指向上方。，we，want，n，pointing，up。,但是，在下表面，要使n指向下面。
So, remember, when we set up the divergence theorem, we need the normal vectors to point out of our region, which means that on the top surface, n But, on the bottom face, we want n pointing down.
当我们建立散度定理时，我们要使法向量指向区域外，即在上表面时，要指向上方。，we，want，n，pointing，up。,但是，在下表面，要使n指向下面。
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