Space travel can be so delightful but at the same time invisibly dangerous.

太空旅行是如此令人愉快，但同时又存在无形的危险。

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If it is, then the moon will become a possible choice for space travel in the future.

如果是这样，那么月球将成为未来太空旅行的一个可能选择。

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This makes commercial space travel a complex legal issue not just domestically, but abroad.

这使得商业太空旅行成为一个复杂的法律问题，不仅在国内如此，在国外也是如此。

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He also produced the thirteen-part series, "From the Earth to the Moon" because of his support for human space travel.

VOA: special.2011.06.17

There is that sense of space, of expansiveness, the possibility of travel.

这是一种空间感，延伸感，对旅行可能性的感受。

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The collision of the Russian and American satellites was the first of its kind in over fifty years of space travel.

VOA: special.2009.04.01

Here's a way: Commit America to big, gaudy, public contests in space travel and energy.

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In many ways these are dreary, dreadfully boring alternatives to moon colonies and space travel.

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Rocket fuel is currently the No. 1 reason that space travel is so expensive.

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