It is obvious that , in general , guard rings should be on both sides of the pcb with plated - through holes 显然，一般情况下，在pcb的上下表面都应设计保护环，二者通过金属化孔相连。
2.
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 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。
3.
Key be flame rings may release 23 instructors to learn skills - agni incantations ; be guard rings lives in the most dangerous time to save a life - rings will be broken 得到火焰戒指可以施放23级导师学习技能烈火咒得到守护戒指可以在生命最危险的时候救一命戒指将破碎。
4.
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 node potential 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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