All you need is a jetliner, a parabola and voila, you're weightless.

你需要的只是一架客机, 飞行个抛物线, 然后看看自己, 你已经失重。

An escape orbit is open — it doesn't come back — and is shaped like a parabola.

逃逸轨道是开放的——它不回来——形状就像抛物线。

The orbit is now a hyperbola, which is similar to a parabola, but is even more open.

轨道是条双曲线，类似于抛物线，但更加开放。

For three weeks, they practiced and performed as the plane did parabolas climbing until it goes over the hump, creating 27 seconds of weightlessness-time to open luggage and release a zillion balls.

他们为此训练3周, 在飞机开始抛物线攀升, 直到已经平稳过关, 创造出27秒的失重状态后, 是时候打开行李, 开始一段震撼人心的表演。