In nature, they often nest on mountaintops and on the sides of cliffs .
在自然界中，它们经常在山顶和悬崖边筑巢。
Ice will vanish from Arctic summers and some mountaintops, permafrost will become impermanent, sea levels will keep rising.
在夏季，冰会从北极和一些山顶消失，永冻层将会变得“无常”，海平面将继续上涨。
Clouds have settled over the mountaintops.
那些云彩在山顶上空停留不散。
Along with arctic animals, species that reside on mountaintops are also experiencing the effects of warming.
和北极圈的动物一样，生活在山顶地区的物种也受到了气候变暖的影响。
They always preferred to build their city walls on mountaintops.
老喜欢把城墙建在山顶上。
They always preferred to build their city walls on mountaintops.
老喜欢把城墙建在山顶上。
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