我的意思是它可能有点弯曲，但大致上，它看起来像空间中的平行四边形。
I mean it might be slightly curvy, but roughly, it looks like a parallelogram in space.
四边形被剪成了平行四边形。
这个平行四边形的面积是多少？
你看，它的确看起来像一个平行四边形。
这个平行四边形仍然有相同的面积，它仍然在同一个平面上。
The parallelogram still has the same area, and it's still on the same plane.
这里有幅更好的图。我说经过C 的是 C左边的这个阴影平行四边形。
Here is a better picture. I claim that what will be going through C is this shaded parallelogram to the left of C.
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。
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.
或者说它可以有轻微的弯曲，但它大体上像一个平行四边形。
I mean it might be slightly curvy, but roughly it looks like a parallelogram in space.
如果它足够小，它可以近似成平行四边形。
答案是5，目前为止，这个平行四边形的面积,是那个正方形面积的5倍。
That's 5. OK, this parallelogram is apparently five times the size of this square.
这面积，约等于平行四边形的一半，我能用向量表示它。
So, the area is approximately equal to one half of the area of a parallelogram that I could form from these vectors.
这个平行四边形有多大呢？
矢量相加还有一种方法，我称为“平行四边形法。”
There's another way you can do it and I call that "the parallelogram method."
那么现在这个平行四边形的面积是多少？
现在在上方的曲面上，有一个平行四边形。
当然这个平行四边形还是有同样的面积，也在同一个平面上。
Sure, the parallelogram still has the same area, and it's still in the same plane.
你们也看到了，它的确看起来像一个平行四边形。
每个三角形的面积等于拼成的平行四边形面积的。
The area of every triangle equals the area of the parallelogram.
每个平行四边形的面积各是多少？
如果该数组包含三个元素，则平行四边形的右下角位置的点可从前三个点导出。
If the array contains three elements, the lower-right corner of the parallelogram is implied by the first three points.
该仪器索赔9日，其中四杆连杆是一个平行四边形。
The apparatus of claim 9, wherein the four-bar-linkage is a parallelogram.
七年级数学要学的东西确实挺难：比例、小数、平行四边形的面积。
The kinds of things you need to learn in seventh grade math, sure, they're hard: ratios, decimals, the area of a parallelogram.
利用平行四边形连杆和齿轮的组合设计了一种外骨骼机构。
A new type of exoskeleton mechanism has been developed by combination of parallelogram link and gear.
两个完全一样的三角形可以拼成一个平行四边形；
师：已知平行四边形的底和高，就可以求出它的面积。
Teacher: We can work out the area of a parallelogram if we know the base and height of it.
棱柱（体），角柱（体）多面固体，上下两底面大小、形状相同，且彼此平行，其余诸面则为平行四边形。
A solid figure whose bases or ends have the same size and shape and are parallel to one another and each of whose sides is a parallelogram.
这是平行四边形的对边。
其整合遵循平行四边形法则。
在两者关系的基础上，提出了组-角色分配的平行四边形法则。
Then based on this relationship, a parallelogram principle for Group-Role Assignment was proposed.
在两者关系的基础上，提出了组-角色分配的平行四边形法则。
Then based on this relationship, a parallelogram principle for Group-Role Assignment was proposed.
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