... tracing of material 追查材料, 查寻材料 tracing of shadows 对物体投影轮廓的准确描绘 tracing paper n. 描图纸 ...
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tracing of shadows
阴影描摹
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Mr. Melvin says he spends hours at the computer tracing power lines, looking for telltale shadows of electric towers or posts.
WSJ: Gulags, Nukes and a Water Slide: Citizen Spies Lift North Korea's Veil
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