n.上等皮紙；精制皮紙
Vellum is a thick tracing paper stock, good for line drawing. 是厚的描圖紙，尤其方便用在針筆線圖上。
Vellum paper with a glazed surface is used for decorative documents. 有光澤的仿牛皮紙，是精美文件用紙。
