AC signal

例句：

1. 1. The AC signal is transmittedthrough the wires.
   交流信号通过电线传输。
2. 2. The AC signal was lost during thetransmission.
   交流信号在传输过程中丢失了。
3. 3.The AC signal is used to control thelights in the room.
   交流信号用于控制房间内的灯光。