以不同深度腺体层作为对照可获得不同的硬度比；
The stiffness of the lesions were different with different level glandular tissue as reference.
图左边示正常食管鳞状上皮黏膜，黏膜下层内粘液腺体，以及由淋巴组织包围的腺体导管。图右侧示食管肌层。
This is normal esophageal squamous mucosa at the left, with underlying submucosa containing mucus glands and a duct surrounded by lymphoid tissue. The muscularis is at the right.
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