1. When a B cell binds to the intruder that it is built to recognize, a biochemical cascade occurs in the cell , triggering the body's immune system to rally to the defense. 
   当b细胞结合其应当识别的人侵病原时，细胞内发生了生化崩溃，引发机体免疫系统集合防御。
2. Immune from taxation; immune from criminal prosecution. 
   免于纳税；免于刑事诉讼
3. Immune to attack; impregnable. 
   固若金汤攻不破的；固若金汤的
4. A person who is immune. 
   免疫者
5. AIDS (Acquired Immune Deficiency Syndrome) 
   艾滋病（获得性免疫缺陷综合征）

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• 1. 免疫活性细胞
  immune clearance 免疫清除...immune competent cell 免疫活性细胞...immune complex 免疫复合物
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• 2. 免疫感受态细胞
  immune competent cell免疫感受态细胞, 免疫活性细胞...immune competent cell 免疫感受态细胞...immune competent cell 免疫活性细胞
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