巨大的双环盆地的外部直径约260公里，内部像是被岩浆填平，多串小型陨石坑放射状地延展散布在双环盆地外围。

The outer diameter of the large double ring crater at the center of the scene is about 260 km (160 mi). The crater appears to be filled with smooth plains material that may be volcanic in nature.

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实验结果证明，将有源滤波器安装在放射状配电网的末端母线上，可在整个配电网上有效地抑制谐波。

Experimental results show that if the active filter is installed on the end bus of the radial power distribution line, it successfully performs harmonic damping throughout the distribution line.

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在弯道处布置放射状的肋片，能够非常好地增强换热。

Also, the ribs in the corners can significantly enhance the heat transfer.

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