Because his motor required two alternating currents and four wires, it could not be merely dropped into existing single-phase AC systems; one would need to install additional wires to the network.
Because his motor required two alternating currents and four wires, it could not be merely dropped into existing single-phase AC systems; one would need to install additional wires to the network.
因为他的马达需要两道交流电与四条导线，所以没法直接用在现有的单相AC系统；电力网上还得再加装导线。