etch angle
... etc 等等 etch angle 蚀痕角 etch mark 刻痕 ...
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在黄河三角洲新识别出6种冰冻沉积构造：冰劈裂缝、冰成滑痕、冰塌裂缝、冰成球粒、冰蚀波痕和冰位痕。
Six sedimentary structures, ice split seams, ice slid marks, ice collapsed seams, ice induced pellets, ice eroded ripple marks and ice level marks, are newly found in Yellow River delta.
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