But if we ground the metal rod, the negative charges repelled by the charged rod now have a place to go: the Earth!
我们接地棒，收费 被充电棒收回的负极！
英语百科
Groundbed
A groundbed is an array of electrodes, installed in the ground to provide a low resistance electrical path to ground or earth. A groundbed is a component in an earthing system.
Each electrode is called a ground rod or a earth electrode.