They were used to outline figures to show boundaries just like you might use solid lines in a pencil drawing.
它们被用来勾勒图形以显示边界,就像你在铅笔画中使用实线一样。
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The photo shows Hepburn posing for one of the movie's iconic publicity shots with pencillines marking up her face, supposedly indicating where the gamine star could use a bit of smoothing.