1·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。
2·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。