The terrain is undulating  with gentle slopes and rolling hills.

地形起伏，坡度平缓，丘陵连绵。

On a plot with a large relief, there should be two such rooms.

在一个地形起伏较大的地块上，应该有两个这样的房间。

Pine cones crunch beneath Dan and Nick's feet as they navigate the undulating terrain.

松果在丹和尼克脚下嘎吱作响，他们在起伏的地形中。

And I was a good runner, and obviously the lighter you are in running when it's hilly at cross-country, the better.

我是个出色的跑， 显然， 在越野跑这种地形起伏的比赛中，体重越轻越有利。

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.

在这里，山脉的北侧，相对干燥，地形起伏较大，永久冻土正在融化。

There was nobody behind her, She turned into the fields, walking under the trees which she did not see, and up hills and down valleys without noticing the incline of either.

她身后空无一人。 她转身步入田野，未曾留意的树荫之下，攀上山丘，又下到谷地， 全然未觉地形的起伏。

Just trying to get this diagnosed because I did not know I had a fracture and I walked on this thing and if you know anything about Lisbon, it is a city of hills and stairs.

只是想弄清楚自己到底有没有骨折， 因为我不知道自己骨折了， 还走来走去。 如果你了解里斯本，那里的城市地形起伏很大， 到处都是山坡和台阶。