以下为句子列表：
英文: Its clinical manifestations are so close to those of acute appendicitis that a differentiation between the two diseases is usually impossible before operation.
中文: 它的临床症状和急性阑尾炎几乎无法分辨，因此通常只有在手术时才能诊断出来。
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英文: Microscopically, acute appendicitis is marked by mucosal inflammation and necrosis.
中文: 显微镜下，急性阑尾炎的粘膜炎症和坏死非常明显。
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