患者,男,16岁,10小时前脐周痛,现腹痛加剧,转移至右下腹,病变尚未波及腹膜壁层。诊断为急性阑尾炎,其腹痛的发生机制是
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
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