translation.en: So, we have just finished a NASA Institute for Advanced Concepts Phase II study, looking at the irreducible set of technologies that you would need in order to actually allow people to inhabit lava tubes on the Moon or Mars.
translation.zh: 所以，我们刚刚建立了一个第二阶段先进概念研究NASA学会 着眼于不可或缺的技术 用于使 人类可以在月球或火星 的熔岩管内生活