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这就是一个抛物线方程。That is a parabola.

这就是那个抛物面，它是开口向上的。It is this parabola and is pointing up.

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它同样是，开口向下的一条抛物线。It's, again, a parabola going downwards.

我们可以画出这样的开口向下的抛物线。So, we should draw maybe this downward parabola.

看，这跟一个开口向上的抛物线类似的。See, it's the same with a parabola going upwards.

这是个抛物线,它完全是对称的This is a parabola and it is completely symmetric.

那是起点在1且开口向下的抛物线。It's a parabola pointing downwards, and starting at one.

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旋转一条抛物线，就能得到这个抛物面。OK, it's what you get by taking a parabola and rotating it.

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.

从这一次，你不会期待它，如抛物线般运动。From this one, you would not expect it to behave like a parabola.

在这样一条条抛物线后面，是一系列扎扎实实的保障工作。In such a rear of the parabola , is a series of solid security work.

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.

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因此我们看到，通过消去时间,就可以得到抛物线的方程。t So you so see now, by eliminating the time that we have here a parabola.

抗弯弹性模量与维管束比量有较高的抛物线关系。There is a parabola correlation between the MOE and vascular bundle proportion.

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.

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.

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.

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在适当的条件下，曲线可精确表示抛物线、圆弧、椭圆弧。In the proper conditions, it provides exact reproduction of parabola and elliptic arc.

建构一动态绘图。展示给定的抛物线外所有成对的正交切线。Construct an animation displaying all pairs of orthogonal tangents to a given parabola.

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.