试验研究表明在相同重量下，设计合理的复合材料对称元件可以比金属元件吸收更多的冲击能量。

Most experimental research had demonstrated that well-designed composite symmetrical elements could absorb more impact energy than metal elements with same weight.

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利用建立在对称分量解耦-补偿理论基础上的电力元件模型，提出了适用于谐波潮流计算的网络模型和算法。

By using the power element models established on symmetrical component decoupling - compensation theory, a network model with algorithm suitable for harmonic flow calculation is developed.

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梯度折射率球透镜是一种折射率以球心为对称中心，并沿球半径方向分布的球型光学元件。

GRIN ball lens is a spherical optical element with refractive index is symmetric around a spherical point and varies in spherical radius direction.

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