also fool's-cap, 1630s, "type of cap worn by a jester;" see fool (n.1) + cap (n.). From c. 1700 as a type of writing paper, so called because it originally was watermarked with a jester's cap.
实用例句
1. The letter is on six sheets of foolscap.
信写在6张大页纸上.
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2. He was still rumbling discontentedly when Pike returned bearing a folder of foolscap sheets.