求翻译：Only the cranial portion of the epiglottis is removed to ensure inclusion of the major predilection site for induced lesions. This site is primarily represented by the epithelial lining of the ventral and ventrolateral luminal surface of the larynx (cranial to the ventral laryngeal pouch). The remaining larynx is trimmed according to the proposed scheme at three levels including base of epiglottis, ventral diverticulum and cricoid cartilage. The three pieces are embedded with the cranial cut surface downwards. The three levels assure recognition of all different epithelial cell types of the larynx and underlying seromucinous glands.是什么意思？

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