那时的伊朗由亲西方的巴列维国王 (Shah Mohammad Reza Pahlavi) 统治，靠着石油美元，武装到了牙齿。
Poincaré disk model. Take the open unit ball \(\mathbb{D}^n = \{x\in\mathbb{R}^n \mid \|x\|，更多细节参见heLLoword翻译官方下载
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a period (which is in the range above)