| 正面 | 4442.unprecedented 英 [ʌn'presɪdentɪd]美 [ʌn'prɛsɪdɛntɪd]     |
|---|---|
| 背面 |     释义： 1. 周边圆圈。adj. 空前的；无前例的 例句： 1. Each home boasts an unprecedented level of quality throughout.每家的质量都堪称一流。 unprecedented (adj.)1620s, from un- (1) "not" + precedented. In common use from c. 1760." |
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