The water level in the lake in late summer 2010, however, was unusual if not unprecedented.
然而在2010年夏末，就算不能说水位是史无前例，也可以说是非同寻常的高。
Thee request by anti-doping officials was extraordinary, if not unprecedented, in the historyof the Olympics.
在奥运会历史上，反兴奋剂官员做出的这一请求即便不是前所未有，也非同寻常。
He had a uniqueness that made him an unprecedented, if not unlikely, candidate.
他拥有这种特质使他成为一位空前的(如果可能的话)候选人。
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