As 90 percent of all crimes occur at night, landscape lighting can do double duty as security lighting.

截至90百分之犯罪发生在夜间，景观照明可以作为安全照明双重任务。

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The on-duty lighting is suitable for making use of part of normal lighting with independent control or part of or whole emergency lighting.

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；

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