The design thus leaves the area under the engines and on the centre of gravity free for the payload.

这样的设计下，发动机叶片的面积和重心的有效载荷自由。

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These amazing pens have a great history of being approved for use in space, since they effortlessly write in the gravity free vacuum of space, and at any Angle.

这些令人惊讶的笔有了不起的历史，被批准在太空试用，因为它们在太空失重的情况下或以任何角度都可以轻松自如地使用。

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A spaceship that reaches escape velocity is moving fast enough to break free of a planet's gravity.

太空船之所以能飞出地球，是因为其飞行速度很快，足以挣脱地球的引力。

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Glenn explained later that at times it helped to be free of gravity.

VOA: special.2009.06.17

For all his faults, Bill Clinton shifted the Democratic Party's centre of gravity on free trade, and law and order.

ECONOMIST: How would the White House attack John Forbes Kerry?

Davis and his sister, Bethie, had been entranced since infancy by this figure, by its bulbous, ghostly white space suit, its forever-unseen face behind the glistening visor of its helmet, its suggestion that perhaps within the interior of the McDonald's there existed some secret gravity-free realm.

NPR: In 'Challenger Park,' Mom Is an Astronaut

Second place gets a free zero-gravity plane flight.

FORBES: Virgin's Top Frequent Flier Gets To Fly For Free - Into Space