Unipolar controllers need center-tapped windings.

单极控制器需要中心抽头绕组。

The United States was enjoying its “unipolar moment”;

美国一直在享受它的“单国时刻”；

In unipolar disorder the evidence of efficacy is less robust.

在单极性疾病方面，有效的证据就不是那么强而有力。

Unipolar hegemony of the United States can not be successful.

单极化的美国霸权是不能成功的。

Today, we have a number of regional balances overlaid by a unipolar pattern.

今天，我们所拥有的很多区域均衡都是在单极所覆盖的。