一定时段内，实际日照总时数占可照总时数的百分率。
研究显示在过去三年中那些日照较多地区的视觉问题发生率猛增。
The study shows a sharp increase in the incidence of vision problems in the sunny regions over the past three years.
日照时间长，加之风热使澳大利亚的蒸发率很高，比大多数其他国家高很多。
Long hours of hot sunshine and searing winds give Australia an extremely high rate of evaporation, far more than in most other countries.
晒黑、多形性日光疹和光老化患病率随着执勤官兵高原入伍时间延长而增高，随着累积日照时数增多而增高；
With the time of being in the army and cumulative sun-exposure period, the prevalence of tanning, photoaging and polymorphous light eruption increased, while the prevalence of sunburn decreased.
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