... 梁顶面 top surface of the beam 丘顶面 hilltop surface 屋顶面 deck ...
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例如向斜、背斜、断层、盐丘，冰碛层之下结晶岩的顶面起伏形态，矿体以及粘土矿床等。
Among such features may be synclines and anticlines, geological faults, salt domes, undulations of the crystalline bedrock under a cover of moraine, ore bodies, clay deposits and so on.
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