彗星上的重力非常小，以至于一束反射的光都会将着陆的探测器送回太空。

The comet's gravity is so low that even a slight bounce could have sent the probe careering back into space.

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后来他们着陆了。 马克很高兴能够安全返回地面。 他用颤抖的声音对他的朋友说： ：“乔治，非常感谢你让我乘小飞机做了两次飞行。”

When they came down again, Mark was very glad to be back safely, and he said to hisfriend in a shaking voice, "Well, George, thank you very much for those two trips in your plane."

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