If you are using an outline or notes, highlight ideas or phrases you should stress in your speech with a different coloured pen or something.

如果你在使用提纲或笔记，用不同颜色的笔或其他东西标记出你在演讲中应该强调的观点或短语。

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Trace the way with a coloured pen.

用彩笔描出路线。

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Lighter-coloured pixels denote less pen pressure on the paper, so differences between samples indicate different patterns of pen pressure and thus the likelihood that different authors were involved.

ECONOMIST: Holographic analysis of handwriting

Drawn on a piece of paper, the spokesman said it was "full of the pop art motifs we have now come to recognise, including Warhol's signature bright red lips, made using lipstick, and a typically pop art blocked background, coloured with green and orange felt-tip pen".

BBC: Warhol sketch