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用白醋和洋葱汁在纸上写字,干了以后,不会留下什么痕迹。这类液体就是最简单的密写水。想要读出用密写水写的字来,只要把纸放在
Use white vinegar and onion juice to write on paper and do not leave any traces when you dry it. This type of liquid is the simplest type of water. Want to read the words written in close-packed water, just put the paper on