某女性病人因全身关节痛、面有蝶形红斑、查血抗Sm抗体(+)确诊为SLE,医嘱病室避免日光直射、病室紫外线消毒时应回避、外出穿长袖上衣及长裤、戴帽或撑伞遮阳、禁日光浴,何故( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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