我们得到一条在一个方向上向下，而在另一个方向上向上的抛物线。
We have a parabola going downwards in one direction, and upwards in the other one.
我们可以画出这样的开口向下的抛物线。
建筑物采用了倾斜的抛物线屋顶。
这是个抛物线,它完全是对称的
这点很重要，你们要知道，这是条抛物线，并且这里，是水平的。
It's important, you have to know that, so this is a parabola and this, here, is horizontal.
得到的是在一个方向上开口向下，而在另外的一个方向开口向上的抛物线。
So, we have a parabola going downwards in one direction, upwards in the other one.
也不是沿一条抛物线轨迹，因为小球是竖直射出的。
It wasn't going into a parabola because I was shooting it straight up.
别老看那条曲线，别老看那些没用的抛物线、曲线。
Don't look at that curve at just some dumb parabola, some dumb curve.
毋庸置疑，是个抛物线，用我刚才得到的，这个已知信息。
It's, of course, a parabola and I use this information that we have just derived.
当飞机以抛物线飞行并暂时抵消部分重力时，学员将能体验到近似失重的状态。
Participants undergo near-weightlessness as the plane is flown in parabolic maneuvers that create temporary reduced gravity.
NASA表示，这一抛物线设计可以通过控制气流来减少冲击波的产生。
The parabola would control air flow in a way that would lessen the shockwave, NASA says.
呈现抛物线的市场，正如许多大宗商品那样，往往会隔一段时间就会在较低水平整固一下。
Markets that have gone parabolic, as the ones for many commodities have, are apt to, um, consolidate every once in a while at lower levels.
所以，试着看，网球是一个，比较理想的抛物线。
So, try to see that the tennis ball is very close to an ideal parabola.
看，这跟一个开口向上的抛物线类似的。
我若在UV做这样做，你会看到漂亮抛物线，就像你看到这只球，或者类似于此的东西。
If I show the whole thing in UV, then you will see the same kind of beautiful parabola as you would see with this ball something like this.
倒霉的失主忘了系上腕带，于是看着他的照相机在空中画了一条完美的抛物线后沉入水中。
It is last seen by its rueful owner, who omitted to use a wrist strap, describing a perfect parabola on its way to the depths.
人类已经研究了抛物线近千年，对它的性质理解的很透彻。
Parabolas have been studied for millennia, and their properties are well understood.
当然，你还是要找到最佳的，这里指对数据点，拟合度最高的抛物线。
And, of course, you are trying to find somehow the best. That would mean here fitting the best parabola for your data points.
现在想象得到的图像,当你垂直切割它时，它是开口向下的抛物线。
And now, you should imagine that you have this thing that when you slice it by a vertical plane, looks like a downward sparabola.
那是起点在1且开口向下的抛物线。
为了营造外太空的微重力状态，飞机从佛罗里达州北部起飞后，在墨西哥湾上空完成了一连串抛物线动作。
To recreate outer-space conditions of micro-gravity, the plane performed 6 parabolic flight 7 maneuvers over the Gulf of Mexico after 8 taking off from north Florida.
测试是在一个抛物线飞行的航空器上，希望年底前能完成。
This will be done on a parabolic aircraft flight hopefully before the end of the year.
这部分是条抛物线，抛物线这边是水平的。
And this part is a parabola and this parabola here is horizontal.
它同样是，开口向下的一条抛物线。
我若是抛铁锤，那么质量重心，也是唯一的质量重心，会沿完美抛物线运动，就像一颗网球。
If I throw up a hammer, then the center of mass and only the center of mass will just go along a perfect parabola as if it were just a tennis ball.
在没有阻力的情况下，会得到一条抛物线，非常均衡的。
In the absence of any air drag, I would get a nice parabola which will be completely symmetric.
现在我要用用这些推出的信息,来做另一边,类似的曲线,不过这个很简单-,只是一条抛物线。
Now I am going to use this information in order to give you a curve which is similar to that one -- except this is a simple one-- this is just a parabola.
现在，牛顿理论认为，有一些彗星沿双曲线或抛物线运行，永远不再返回；另外一些彗星沿普通的椭圆轨道运行。
Now according to Newtonian theory, some of them moved in hyperbolas or parabolas never to return; others moved in ordinary ellipses.
这是一个x的二次方程，也是一个抛物线方程式,抛物线都长这样。
It's a second-order equation in x, and is a parabola and a parabola has this shape.
每一块抛物线将阳光聚集在一根沿着玻璃镜槽的管道上，能量被聚集用于加热里面的水，最终产生蒸汽推动连接在泵上的蒸汽机。
Each parabolic trough focused sunlight onto a tube running along its length, heating the water inside it.
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