Epithelium also lines the air tubes and lung cavities.
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2. 窦的壁衬盖着内吞细胞，这些细胞能吞食淋巴中可能出现的任何一种外来颗粒。
The walls of the sinuses are lined with endocytic cells which engulf any foreign particles that might be present in the lymph .
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3. 本机磨辊上装有可更换耐磨衬板，连续使用寿命可达一年以上，磨损严重时，移开机盖即可更换。
The machine is equipped with a removable roller wear-resistant lining, continuous service life of up to one year or more, wear serious, remove the lid can be replaced.
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4. 本机磨辊上装有可更换耐磨衬板，连续使用寿命可达一年以上，磨损严重时，移开机盖即可更换。
The machine is equipped with a removable roller wear-resistant lining, continuous service life of up to one year or more, wear serious, remove the lid can be replaced.
