利用极值理论，讨论斜抛物体运动轨迹的极值条件。
We study the extremum conditions of the locus of motion of oblique projectile by using the extremum theory.
随后，证明了旋转抛物体的体积为同底同高圆柱体体积的一半。
What follows, it gives a proof that the volume of rotating parabolic body is half of a cylinder which has the same bottom and height.
换句话讲，一个做抛物体，在它的发射角度是45度的时候飞的最远。
A projectile, in other words, travels the farthest when it is launched at an Angle of 45 degrees.
本文提出斜抛物体的运动方程可用一个矢量式表示，并阐述了它成立的条件。
This paper advances a vector formula showing movement equation of inclined projectile body, and expoundes the condition for its establishing.
这表明使抛物体能够抛到高处的最好方法就是使它以跟地面成90度的角度抛出，也就是竖直往上抛出。
That means that the best way to launch a high-altitude projectile is to send it flying at a 90-degree Angle to the ground-straight up.
这表明使抛物体能够抛到高处的最好方法就是使它以跟地面成90度的角度抛出，也就是竖直往上抛出。
That means that the best way to launch a high-altitude projectile is to send it flying at a 90-degree Angle to the ground-straight up.
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