人类在漫长的进化过程中形成了防御病原体的一道又一道防线.皮肤皮肤和黏膜黏膜是保卫人体的第一道防线体液中的杀菌物质杀菌物质和吞噬细胞吞噬细胞 Template




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tomski人类在漫长的进化过程中形成了防御病原体的一道又一道防线.皮肤皮肤和黏膜黏膜是保卫人体的第一道防线体液中的杀菌物质杀菌物质和吞噬细胞吞噬细胞 coloring