But the Moon offers a great local to test out human missions to Mars.

但对于人类的火星使命来说，月球是个伟大的试验场。

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NASA says the first human missions to Mars could take place by the 2030s.

美国宇航局表示，可能于本世纪30年代实现首次人类火星登陆任务。

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One way for human missions to Mars is to set up a base on the moon to be used as a steeping-stone.

把人类送上火星进行探测的一种方法，是在月球上建立一个基地，用来作踏脚石。

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Experience gained from new journeys to the Moon would be used in "human missions to Mars and to worlds beyond", the president said.

BBC: NEWS | Science/Nature | Bush unveils Moon and Mars plans

With the experience and knowledge gained on the moon, we will then be ready to take the next steps of space exploration: human missions to Mars and to worlds beyond.

CNN: Bush: 'It is time for America to take the next steps' in space