几何规定旋转对称只能以二次，三次，四次和六次存在。
Geometry dictates that only two -, three -, four - and six-fold rotational symmetry can exist.
然而几何学告诉我们，只有二次、三次、四次和六次的旋转对称是能够存在的形式。
That is impossible. Geometry dictates that only two-, three-, four- and sixfold rotational symmetry can exist.
本文将三次谐波注入的PWM控制方案应用到四桥臂三相逆变器中，可以带非对称负载且具有较高的电压利用率。
The PWM control strategy with 3-th harmonic in addition is presented for four-leg three-phase inverter, the inverter can deal with unbalanced load and has a high utilization of dc bus voltage.
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