For example, any space mission involving a landing on Mars will confront the problem of movement on that planet's rugged surface, which is too rocky for a wheeled vehicle like the moon buggy.
例如要登陸火星，星球表面崎嶇不平，過去使用的月球車以輪子行走，就無法克服這類的障礙。如果能發明類似木牛流馬這樣純粹以機構、桿件設計的步行機器，就可以派上外太空了。