He delivers a brief TED-style talk, while behind him we see a topographic model of what looks like blackened lunar crust.

做了一个TED风格的简短演讲，而后，我们看到了一个看似发黑的月壳形模型。

Topographic and ecological barriers, much more pronounced on some continents than on others, were locally important obstacles to diffusion.

形和生态障碍某些大陆上比其大陆上更为明显，是当传播的重要障碍。

In sum, as far as geography is concerned, there are four recognizable and definable topographic regions in the United States.

总而言之， 就理而言，美国有四个可识别和可定义的形区域。

Get lost for a little while, but not like lost, lost, because you can take topographic and offline maps with you.

迷路一会儿， 但不像迷路、迷路，因为你可以随携带形和离。

Here on the north side of the mountains, where it's relatively dry, and we have a lot of topographic relief, we have thawing permafrost.

山脉的北侧，那里相对干燥，我们有很多形起伏，我们有融化的永久冻土。

Sadly, it was already in darkness by the time New Horizons was able to capture it, so the images  aren't quite as clear as those of Wright Mons, but you can see it here in this colourized topographic  map.

可悲的是， 当新视野号能够捕捉到它时， 它已经处于黑暗之中，所以像并不像莱特蒙斯的像那样清晰，但你可以这张彩色形中看到它。