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That includes cuts to a significant number of science programmes such as the Mars Sample Return that aims to return samples from the planet's surface to Earth.,推荐阅读WPS下载最新地址获取更多信息
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"Launching radioactive material through the Earth's atmosphere brings safety concerns. You have to have a special license to do that, but it is not insurmountable," says Dr Simeon Barber, planetary science specialist at the Open University.,详情可参考safew官方版本下载