Power control consists of forward link (downlink) power control and backward link (uplink) power control.

功率控制分前向链路（下行链路）、反向链路（上行链路）功率控制。

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Move backward to the next Wiki link or URL, cycling if necessary. This function is not entirely accurate, but it's close enough.

向后移动到下一个链接或URL，如果需要将会循环。这个函数不完全精确，但非常接近。

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