surface occurence
surface occurence 地表显示；地面产状；地表露头; 地面产状 earliest event occurence time 事件最早发生时间 .
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露头宽度与厚度的关系取决于岩层的产状、地面坡度和路线方向。
The relation between outcrop width and thickness depends on the dip of the bed, the slope of the ground, and the direction of traverse.
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