同时，PD64004A能与PD64012作各种形式的结合，使交换机制造商可设计4埠至48埠自发的自我维护（self-maintained）PoE，支援侦测、即时保护，以及交流讯号侦测断电或直流讯号侦测断电等功能。
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self maintained discharge 自持放电
non-self-maintained discharge [电] 非自持放电
non self maintained discharge 非自持放电
non-self-maintained gas conduction [电子] 非自持气体导电
self-maintained push-button 自持按钮
self-maintained gas conduction 自持气体导电
discharge self-maintained 自持放电
self-maintained discharge [电] 自持放电
She thought his smug two-year-old grin of self-amusement and satisfaction would drive her to the brink, but she maintained her composure.
她认为她那两岁的儿子沾沾自喜、洋洋得意的咧嘴一笑，足以把她推向崩溃的边缘，但她仍然保持镇定。
In short, the Sun's large-scale magnetic field is taken to be self-sustaining, so that the solar-activity cycle it drives would be maintained with little overall change for perhaps billions of years.
简单来说，就是太阳的巨大磁场被用来进行自我维持，所以，由其驱动的太阳活动周期将会在几十亿年的时间里维持整体上维持极小的变动。
Phone can be only installed and maintained by professionals. self install and maintain may cause danger, and against guarantee regulations.
只有专业人员才能安装或维修手机。自行安装或维修手机可能性带来很大的危险，而且违反保修规定。
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