| 单词 | 无先例 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔precedent〕This situation is without precedent.这种情况尚无先例。外研社新世纪〔unheard-of〕It's unheard-of to pass the examination so young.如此年轻即通过考试实无先例。英汉大词典〔weak〕They were on weak ground, with no precedents for their action.他们的理由不充分，因为他们的行动并无先例。麦克米伦高阶 |
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