Typically, one set of wires (for one line) contai a red wire and a green wire.
通常，一组电线（一线）包含一个红色线和绿色线。
The four wires are usually characterized as a red and green pair and a black and white pair.
四线通常被描绘成一双红色和绿色和一双黑色和白色。
The four wires are usually characterized as a red and green pair and a black and white pair.
四线通常被描绘成一双红色和绿色和一双黑色和白色。
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