1A file with a smooth edge.
2Photography. An opaque border round a negative.
Early 19th century; earliest use found in James Smith (1775–1839), writer and humorist. From safe + edge.
英语词典包含464360条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。