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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Then you become free of all laws and all gravity.

那么你就自由于法律和所有的羁绊之外。

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

VOA: special.2009.06.17

Two thousand years hence, Sherwood says hypothesized collections of Asteroidal materials congregating at the Earth-Sun L4 and L5 gravitational equilibrium points would make for building materials to construct a large rotating pancake disk capable of housing thousands of people in the comfort of a free-breathing atmosphere and some form of artificial gravity.

FORBES: Space Architecture And View Condos In Low Earth Orbit

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?

Scientists said they launched the satellite from midair to save money, compared with an expendable rocket launched from the ground, because it doesn't take as much fuel to break free of the planet's gravity.

WSJ: NASA NuStar Telescope to Hunt for Black Holes