㆒般认为，美国目前虽位居「单极体系 (Unipolar system)的权力优势㆞位 (Wohlforth, 1999)，但㆗共将是美国最大的挑战对手 (Iain Johnston and Ross, 1999;
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unipolar HVDC system 单极高压直流系统
The key technology of realization of quick and reliable design of controller is to apply the limited unipolar pattern PWM system as the primary channel of the fully-digitized controller.
采用受限单极模式P WM系统作为全数字化控制器主控通道，是实现控制器快速可靠设计的关键技术。
Based on the power supply for railway signal system, this dissertation investigates an inverter controlled by the strategy of unipolar modulation.
本文以铁道信号电源为背景，研究了一种单极性调制的逆变电源。
Macau's multiple education system is likely to decline, culminating in a unified or a unipolar situation without proper guidance and necessary improvements.
因此，如果没有正确的指引和必要的改良，任其盲目发展，澳门多元的教育体制很可能走向式微，最终出现一元化或单极化的局面。
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