"We've got to do something where we can get more value out of space and the lunar surface than we put into it. And that's how you really ignite an economy, and that's how everything we want to do in space is not perpetually dependent on taxpayers."
刘成和妻子都已年近四十。在选择代孕前，他们做过两年半的试管，取卵7次、移植胚胎6次，全都没有着床。
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Last year, Natural Resources Wales said building a flood defence wall was "not economically viable".
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