在接口背后，实现是由所有者单独控制的。
Behind the interface, the implementation is governed solely by the owner.
值班照明宜利用正常照明中能单独控制的一部分或利用应急照明的一部分或全部；
The on-duty lighting is suitable for making use of part of normal lighting with independent control or part of or whole emergency lighting.
但是如果扩展的规范不是对源于单独控制的失效状态的提高，则其就是不恰当的。
However if the specification for the spread is not a refinement of the virtual condition derived from separate control then it is inappropriate.
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