sheepskinn.
英 'ʃiːpskɪn | 美 'ʃipskɪn
中文n. 羊皮；羊皮纸；羊皮革；毕业证书
词根词源
sheepskin (n.)c. 1200, "the skin of a sheep," from sheep + skin (n.). Meaning "diploma" dates from 1804; so called because formerly made of sheepskin parchment.
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