马斯克想在火星上建一座能自给自足的城市。可到了火星，你喝的每一口水、吸的每一口气，都得自己造出来。人在那儿到底怎么过日子？
Elon wants a self-sustaining city on Mars. But out there, every sip of water and every breath of air is something you have to make yourself. So what's daily life actually like?
@elonmusk @SpaceX
