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| 51. | Immunity in this sense can be acquired "actively" by direct exposure of the subject to an infectious organism. |
| 从这个意义上说，免疫力可以通过直接暴露于感染源而“主动”获得。 |
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| 52. | The ability to respond immunologically to bacteria, viruses, or other antigenic agents. |
| 免疫力对细菌、病毒或其它抗生药的免疫反应能力 |
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| 53. | were developing a degree of resistance to this disease, |
| 兔子对这种疾病已产生了一定程度的免疫力， |
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| -- 来源 -- 新概念英语第四册 - A man-made disease |
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| 54. | "Some diseases, such as whooping cough and chicken pox, usually leave a child immune, or protected, for the rest of his life." |
| 某些疾病，如像百日咳和水痘，通常让孩子产生终生免疫力。 |
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| 55. | Diphtheria is treated with an antitoxin that neutralizes the toxin and produces long-term immunity. |
| 治疗方式为及时注射白喉抗毒素,产生长期的免疫力。 |
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| 56. | It later became apparent that rabbits were developing a degree of resistance to this disease. |
| 后来，兔子显然对这种疾病产生了一定的免疫力。 |
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| 57. | These irradiations may cause the leukopenia, reduce the human body immunity. |
| (4)这些射线会使白血球减少，降低人体的抵抗力和免疫力。 |
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| 58. | Immunodeficiency: Defect in immunity that impairs the Body's ability to resist infection. |
| 免疫不全:免疫力的缺陷削弱身体抵抗感染的能力。 |
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| 59. | immunity to a particular disease that is not innate but has been acquired during life; immunity can be acquired by the development of antibodies after an attack of an infectious disease or by a pregnant mother passing antibodies through the placenta to a fetus or by vaccination. |
| 不是天生的而是后天获得的对某一疾病的免疫力。 |
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| 60. | a mixture of toxin and antitoxin used to immunize against a disease. |
| 用来提高抵抗疾病的免疫力的毒素和抗毒素的混合物。 |
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