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The mystery of why soft shoes squeak on hard floors may be solved, according to new research。业内人士推荐夫子作为进阶阅读
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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.，更多细节参见51吃瓜