Next, we inserted the ground wire into the flight muscle of the wing.

接下来，我们将地线插入机翼的飞行肌肉中。

It has a ground wire, and it has a wire for the left antenna and the right antenna.

它有一根地线，还有一根用于左天线和右天线的电线。

Franklin himself, insulated by the silk string, became the ground wire of a giant atmospheric circuit, and the sparks he witnessed proved once and for all that thunderclouds are electrified.

富兰克林本人被丝线绝缘，成为巨大的大气回路的接地线，他目睹的火花一劳永逸地证明了雷云是带电的。