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Of a ticket, reservation, etc.: valid without restriction as to date of use.
1970s; earliest use found in Peter Driscoll (b. 1942). From open + dated, after open date.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。