"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.
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图①：在陕西白水县，西北农林科技大学白水苹果试验站站长高华（右）和硕士研究生于萌正在检测苹果糖度。，详情可参考Line官方版本下载
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