Wojakowski: They dig, like, really, really complex burrowing structures underground.

沃亚科夫斯基：它们在地下挖掘非常非常复杂的洞穴结构。

The only thing that's clear is that whoever built this underground structure put an immense amount of time and care into its construction.

唯一清楚的是，建造这座地下建筑的人投入了大量的时间和精力。

This is a farm that we installed in central Beijing in an underutilized underground parking structure to grow vegetables for the nearby hotels.

这是我们在北京市中心一个未充分利用的地下停车场建造的农场，为附近的酒店种植蔬菜。