拼音：tiě quàn dān shū
注音：ㄊㄧㄝˇㄑㄩㄢˋㄉㄢㄕㄨ
解释：铁券：用铁制的凭证；丹书：用朱砂写字。古代帝王赐给功臣世代享受优遇或免罪的凭证。文凭用丹书写铁板上，故名。
出处：《后汉书·祭遵传》：“丹书铁券，传于无穷。”
Iron certificate: a certificate made of iron; Dan Shu: write with cinnabar. Ancient emperors gave meritorious officials a certificate of preferential treatment or impunity for generations. The diploma is written on an iron plate with a Dan book, so it is named.
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