- 正反: positive and negative
- 标志: sign; mark; symbol; hallmark ...
- 标志正反器: flag flip-flop
- 正反: positive and negative 总结正反两方面的经验 sum up both positive and negative experience; 正反两方面的看法 the pros and cons; 正反配板法 book matching; 正反射 normal reflection
- 获得反标: winning bid
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