在显微镜下，肝脏是由肝小叶为单位的网状结构。
When viewed under a microscope, the liver is seen as large network of units called hepatic lobules.
结论：正常肺小叶结构可在HRCT图像上显示和辨认，肺小叶是肺脏放射学基本单位。
Conclusion: HRCT can detect secondary pulmonary lobules in normal subjects, which may be a basic anatomical unit in pulmonary imaging.
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