| 释义 |
blue AHD[blo͞o] D.J.[bluː]K.K.[blu]blued, blu.ing, blues out of the blue - From an unexpected or unforeseen source:出乎意料的：来自没有想到或没有预测的：criticism that came out of the blue.突如其来的批评
- At a completely unexpected time:突然的，始料不及的：在意料不到的时间里：arrived out of the blue.突然拜访
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