免疫系统有各类细胞吞噬和分解吸入的物质。
The immune system has all kinds of substances absorbed in cytophagy and cell decomposition.
结论SD大鼠脾脏指数、胸腺指数、肺泡巨噬细胞吞噬功能存在秋低春高的季节节律，这可能是秋季季节性呼吸系统多发病的病理生理学基础之一。
Conclusion There are seasonal rhythms of the functions in the spleen, thymus and alveolar macrophage in SD rats, which are lower in autumn than that in spring.
结论SD大鼠脾脏指数、胸腺指数、肺泡巨噬细胞吞噬功能存在秋低春高的季节节律，这可能是秋季季节性呼吸系统多发病的病理生理学基础之一。
Conclusion There are seasonal rhythms of the functions in the spleen, thymus and alveolar macrophage in SD rats, which are lower in autumn than that in spring.
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