An unbalanced line is generally a single-conductor shielded cable with the center conductor carrying the signal and the shield at ground potential.
对于非平衡式信号线来说，就是一根被屏蔽了的信号线，这个中心信号线传输信号，且相对于地电势。
2
Once an old player has described such a "fried-line every day have, copy all over the place, smoke everywhere are strange, anti-shield is not titles", which illustrates the island adventure smoke.
Early in the morning, in the Yongan subway station in Beijing, China's first subway line - Beijing Metro line 1 successfully established the first shield door.