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export PATH="$PWD/nodejs/bin:$PATH"，推荐阅读safew官方版本下载获取更多信息
（十）放射性废物，是指含有放射性核素或者被放射性核素污染，其浓度或者比活度大于国家确定的清洁解控水平，预期不再使用的废弃物。，更多细节参见safew官方下载
"If you build a nuclear reactor or or any kind of base on the moon, you can then start claiming that you have a safety zone around it, because you have equipment there," says Dr Barber.