tracing paper
US /ˈtreɪ.sɪŋ ˌpeɪ.pər/
UK /ˈtreɪ.sɪŋ ˌpeɪ.pər/

1.
papel de calco, papel cebolla
a type of translucent paper used for tracing images or designs
:
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She used tracing paper to copy the intricate drawing.
Ella usó papel de calco para copiar el dibujo intrincado.
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Architects often use tracing paper for their preliminary sketches.
Los arquitectos a menudo usan papel de calco para sus bocetos preliminares.