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古时,为防止文书泄密和潮湿,用蜡制成圆壳,置书其中,又称蜡弹。小说《说岳全传》第十六回中便有这样的情节。
In ancient times, in order to prevent the instrument leaks and humid, made of wax shell, set books which, also known as wax bomb. There is such a plot in the 16th episode of the novel Yue Shu Quan.