Topographic maps show the northern hemisphere has much lower elevations than the southern, and can be depressed by several kilometers.

地形图显示，火星北半球的海半球的低很多，可能被压缩了好几千米。

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

他做了一个TED风格的简短演讲，而在他身后，我们看到了一个看发黑的月壳地形模型。

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

总而言之， 就地理而言，美国有四个可识别和可定义的地形区域。

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

迷路一儿， 但不像迷路、迷路，因为你可以随身携带地形图和离线地图。

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.

在山脉的北侧，那里相对干燥，我们有很多地形起伏，我们有融化的永久冻土。