A cable consisting of one conductor, usually a small copper tube or wire, within and insulated from another conductor of larger diameter, usually copper tubing or copper braid.

• 一种电缆,它的中心是一根导体,通常为较细的铜管或铜线,其周围为绝缘介质,外面为直径较大的导体,通常为铜管或铜编织物。