polarity reversal

例句：

1. 1.The company's strategy has undergone a significant polarity reversal since the last quarter.
   该公司的战略自上一季度以来发生了显著的极性反转。
2. 2. The research team found that the polarity reversal was due to a lack of communication between departments.
   研究团队发现，极性反转是由于部门之间沟通不足造成的。
3. 3.The policy change had a polarity reversal effect on the market sentiment.
   政策变化对市场情绪产生了极性反转效应。