Rough fan sketch (drawing) background—no formal drawings exist;
粗略范素描（绘画）背景并没有正式的图纸存在；
Geologic sketch drawing is basic work which geologic party invests great technical force and money.
地质素描的编绘工作也是地质队投入技术力量最多的、最经常的一项基础性工作。
Geologic sketch drawing is basic work which geologic party invests great technical force and money.
地质素描的编绘工作也是地质队投入技术力量最多的、最经常的一项基础性工作。
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