求翻译：PCR基因检测方法可对PRRS的发生进行早期诊断，但不能明确PRRS的发病阶段和状态；不同发病阶段病理形态学特征观察可以明确猪蓝耳病不同发病阶段，因此，本实验为建立猪蓝耳病不同发病阶段病理学诊断方法提供了依据，对于针对本病不同发展阶段采取有效控制措施，提高防控效果具有重要作用。是什么意思？

PCR gene detection method for early diagnosis of the occurrence of PRRS, but not the incidence of specific stages and PRRS status; different stages of disease can be clearly observed pathological features of blue ear pig disease in different stages of disease, therefore, this study for the establish

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PCR gene detection method may on PRRS of occurred for early diagnosis, but cannot clear PRRS of onset stage and State; different onset stage pathological morphology features observation can clear pig blue ear disease different onset stage, therefore, this experimental for established pig blue ear di

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