Like a telescope, it has a curved mirror to collect the sunlight.
《柯林斯英汉双解大词典》
2. 双曲曲面，即通常所称的负曲率，因为它的表面同时向上和向下弯曲，就像一个马鞍。
The hyperbolic surface, which has so-called negative curvature because its surface curves up and down at the same time, like a saddle.
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3. 大多数天线被制成碟形，用以收集和反射无线电波至亚反射器，就像曲面镜将可见光聚焦于一点一样。
Most antennas are made in the shape of a dish to collect and reflect the radio waves to the sub reflector, in the same way as a curved mirror focuses visible light to one point.
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4. 弯月面容器中之静止液体的弯曲上表面，如果液体浸润了容器壁，那么弯曲面呈凹状。
The curved upper surface of a nonturbulent liquid in a container that is concave if the liquid wets the container walls.
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5. 需要规定曲面的某一方向为正向。
We need to choose a side of the surface.
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6. 这里它们通过曲面方程相互联系着。
Here they are related by the equation of a surface.
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7. 实际上它是空间中的一个曲面。
And, now that will become, actually, a surface in space.
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8. 那么你将永远不能封闭这个曲面。
And, you'll never be able to actually close your surface.
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9. 对于方向，则是曲面的法方向。
And, in terms of direction, it will be normal to the surface.
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10. 你有一个曲面，上面没有缝隙。
You have a surface and there is somehow no gaps in it.
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11. 我们的曲面是由一个函数图像给出的。
My surface is given by the graph of a function.
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12. 对于曲面积分，也已经知道如何计算。
And, surface integrals, we know also how to evaluate.
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13. 给你这个曲面和这个曲线作为它的边。
Let's say that I gave you this curve bounding this surface.
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14. 那么我可以选择一个被C界定的曲面。
So, then I can choose my favorite surface bounded by C.
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15. 我们会遇到各种不同的抛物面和曲面。
I mean there are many paraboloids in life and other surfaces, too.
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16. 图像是空间里的一个曲面。
Its graph will be a surface in space.
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17. 那么，S实际上是这个完整的封闭曲面。
So, s is actually this whole closed surface here.
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18. 比如说我们的曲面就是一个倾斜的平面。
Let's say that my surface is just a slanted plane.
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19. 当我说向上时，它当然仍是垂直曲面的。
I mean when I say up, of course it is still perpendicular to the surface.
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20. 让我们看一种曲面的边缘。
Let's look at a marginal kind of surface.
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21. 它不是这个曲面的一部分。
But, that's not a part of the surface itself.
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22. 它和曲面有相同的法向量。
All right, it has the same normal vector as the surface.
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23. 然后让食指指向那个曲面。
Then I want to make my index finger point towardS the surface.
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24. 这就是一种提醒我们曲面是封闭的的记号。
It is just a notation to remind us closed surface.
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25. 一条与曲面相切的直线。
And that line is tangent to the surface.
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26. 它可以是曲面上想要的任意长度的法向量。
It can be a normal vector of any length you want to the surfaces.
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27. 事实上，这就是所谓的确定曲面定向的过程。
So, in fact, this is called choosing an orientation of a surface.
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28. 我们并不关心曲面之外的事情。
But we don't care about what happens outside of this.
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29. 我断言这条曲线，界定了另一个可定向的曲面。
Well, I claim this curve actually bounds another surface that is orientable.
