"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.
美國總統特朗普（Donald Trump，川普）在競選總統期間，曾承諾將會實施更嚴厲的移民政策和更嚴格的執法措施，他曾經明確表示：「上任第一天，我就會展開美國史上最大規模的罪犯驅逐行動。」
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Failures within the system have been known about, and reported on, for years. The BBC has spent more than a decade speaking to bereaved and harmed families following poor care at Morecambe Bay, Shrewsbury & Telford, East Kent, Nottingham, Leeds and a number of other NHS Trusts, gathering evidence of failing maternity services.。业内人士推荐快连下载安装作为进阶阅读
"It's the early days and they're still showing this in small numbers at the moment.