主要提出镶嵌状的面、元素层叠形成的面、地块-街区-街道形成的面三种面元素。
The paper proposes three kinds of the surface factors, i. e. the surface of the Mosaic, surface of the element layer, surface of the "plot-block-street".
山峰底部的层叠物中还含有粘土和硫酸盐，这两类物质都是在水的作用下才能形成。
The layers at the base of the mountain contain clays and sulfates, both known to form in water.
另一个亮点是它的功能，当层叠起来之后，你的视野有20度的范围，但不会对邻近单元形成阻挡。
Another cool feature is the ability, while stacked on the superstructure, to pivot your view twenty degrees without disruption of neighboring units.
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