upward velocity的意思|示意

This much is certain: the tendency is upward with the march of civilization, toward a higher velocity.

有一点非常确定：随着文明的进步，流通速度将保持上升的趋势。

Given that the world has gravity, that upward velocity won't last long; eventually, the sphere reaches the apex and begins its descent.

由于这个环境中具有地心引力，因此向上的速度不会坚持很久；最后这个球会上升到顶点并开始下降。

The source example in Listing 1 shows a simple world with Mars' gravity and a sphere that currently has some upward velocity.

清单 1 中的源代码给出了一个简单的例子，这个环境中中存在火星的地心引力，里面有一个球具有向上的速度。