早期数据显示，可能的冰层存在于被永久遮挡的月球两极附近的陨石坑中，在月球漫长的历史过程中，彗星撞击带来的水可能埋藏在这些陨石坑中。
Earlier data indicated possible ice deposits in permanently Shadowed craters near the moon's poles, where water from comet impacts could have been trapped over the moon's long history.
城市空间结构的演变是一个漫长的过程，在不同的历史时期，其形态结构具有明显的区别。
The evolution of urban spatial structure is a long process, and its Structure have obvious difference in different historical periods.
在漫长的历史过程中，盐逐渐形成了自己的一套文化体系，除此之外，它又与民俗文化体系产生了一系列的渗透和互动，并且获得了更多的文化蕴涵。
The salt gradually formed a set of cultural system in the long historical process. In addition, it also interacted with the system of the folklore culture, and obtained the more cultural implication.
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