芭蕾舞台是一个明亮的，看起来无重量的世界，在那里重力一直被演员（）。

The ballet stage is a bright, seemingly weightless world where gravity is continually being ------- by the dancers.

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如果我从100米的楼上跳下去，无重量时间大概是4。5秒，忽略空气阻力不计。

If I jump from a tower which is 100 meters high I will be weightless for 4.5 seconds ignoring air drag.

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在这一计划中，反质子被收集起来装进一个巨大的燃料箱，该燃料箱实际上就是环绕在飞船周围长达几百米的无重量云团。

The antiprotons in this scheme would be gathered into a vast fuel tank, a nearly weightless cloud hundreds of meters long surrounding the craft.

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