重力牵引器发射地越快，达成目标的花费也就越小。

The faster a gravitational tractor is dispatched, the smaller and cheaper it need be to achieve its goal.

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鲁博士将其称之为“重力牵引器”，其优势在于极有可能将小行星完好无损地撵走。

The advantage of such a "gravitational tractor", as Dr Lu has dubbed it, is that it is more likely to leave the asteroid intact.

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科学家们认为这个速度加上行星的重量屈服于强大的重力牵引力，可以改变行星的运行轨道。

Scientists think that this speed coupled with the planet's heft yields strong gravitational tugs that can alter the planets orbit.

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