"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.
Is it something like this?。WPS官方版本下载对此有专业解读
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Любовь Ширижик (Старший редактор отдела «Силовые структуры»)