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I talk as I sketch, too, in order to keep their minds off what I'm doing so I'll get the most natural expression I can from them. Also, the talking helps to size up the subject's personality, so I can figure out better how to portray him.
我也边说边画，为了让他们忘记我在做什么，这样我就能从他们那里得到最自然的表达。此外，谈话有助于评估主题的性格，这样我就能更好地描绘他。