求翻译：　　Panasonic started selling its HD-PLC Ethernet adapters for power lines last month. One adapter is attached to a router with a short Ethernet cable and plugged into a nearby wall socket. The second device is plugged into a socket elsewhere in the house. When a computer is linked to it with an Ethernet cable, data is transmitted through the home’s electrical wiring at speeds of up to 190 megabits a second.是什么意思？

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