以下为句子列表：
英文: If the node is at, or near to, ground then a grounded guard ring will be appropriate, if it is at some other potential it may be necessary to use a high input impedance buffer amplifier, with its input connected to the node, to force the guard ring to the
中文: 如果被保护的节点的电位是（或接近）零电位，采用地线保护环最为合适；如果节点电位是其他值，那么可以用高输入阻抗放大器组成缓冲器，输入端连接该节点，输出端连接保护环。
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英文: In applications where high impedances and very low currents are involved a guard ring may be used to minimize the effects of low insulation resistance.
中文: 保护环用在那些高阻抗或电流非常微弱的电路中，用于减轻因绝缘电阻不够高而产生的（漏电）问题。
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