A point considered to be at nominal zero potential and to which all other potentials in the circuit are referred, often, but not always, connected to the actual surface of the earth; as a verb to connect to a ground. Also called earth.
分词翻译
标的英语翻译：
mark; sign 【医】 guide; mark; marker; scale
称的英语翻译：
balance; call; fit; name; say; state; term; weigh up
