daylight ratio
天然照明率
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在工业上,潮湿的以天然气来照明的车间的环境有一些改进,但对于磨房主要弥补的逐渐升高的疾病率来说很牵强。
In industry some amelioration of the atmosphere in the steamy, gas-lighted workrooms was forced on mill owners to offset an increasing sickness rate.
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