差不多有一半的南极海岸线由冰架构成，海岸地表平坦或稍有起伏。
Ice shelves make up nearly half of the Antarctic coastline and have level or gently undulating surfaces.
佩伦和他的研究小组推测，火星的海岸线一度在赤道附近，在随着倾斜的星球向北移动的过程中，变形为起伏不平的岩石高地。
Perron and his team reasoned that the oceanic shorelines were once near the equator, but warped into hilly up-and-down elevations of rock as they move towards the north with the tilting planet.
在由海浪、天空和岩石构成的海景边缘，森林的线条沿着海岸起伏，被勾勒得鲜明清晰。
Up and down the coast the line of the forest is drawn sharp and clean on the edge of a seascape of surf and sky and rocks.
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