这个政治议题的讨论变得两极分化，几乎没有中间立场。

The discussion on this political issue became ___bipolar, with almost no middle ground.

他的情绪波动很大，后来被诊断为患有双相情感障碍。

His extreme mood swings led to a diagnosis of ___bipolar disorder.

这块磁铁是双极的，一端是北极，另一端是南极。

This magnet is ___bipolar, with one end as the north pole and the other as the south pole.