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parabola

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And this part is a parabola and this parabola here is horizontal.(这部分是条抛物线，抛物线这边是水平的。)
See, it's the same with a parabola going upwards.(看，这跟一个开口向上的抛物线类似的。)
This is a parabola, so it's completely symmetric about the vertical, about p.(这是个抛物线，因此关于P点轴对称。)
It is this parabola and is pointing up.(这就是那个抛物面，它是开口向上的。)
So, we should draw maybe this downward parabola.(我们可以画出这样的开口向下的抛物线。)
If there were no drag, then this, of course, would be a parabola, and the horizontal velocity would always be the same.(如果没有阻力，这应该是个抛物线，水平速度，也应该一样。)
This one, you would expect it to behave perfectly like a parabola.(这次你能预料到，它沿抛物线运动。)
It's, of course, a parabola and I use this information that we have just derived.(毋庸置疑，是个抛物线，用我刚才得到的，这个已知信息。)
We just parabola, you is the focal point and I am alignment.(我们就是抛物线，你是焦点，我是准线。)
It's, again, a parabola going downwards.(它同样是，开口向下的一条抛物线。)

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