单词：natural immunity
natural immunity的用法和样例：
例句
- The disease robs the body with its natural defences against infections.这种疾病攻击身体的天然免疫系统导致感染。
- Defensive mechanisms based upon germline-encoded receptors constitute a system of innate immunity.遗传而来的受体所建立的防御机制为天然免疫系统。
- The body has a hard time eliminating the bacteria completely, and natural immunity after a bout with the microbes lasts only about six months.一来人体不易将它们给驱逐殆尽，再者染上一回披衣菌所产生的自然免疫，也只能维持六个月左右。
- innate immunity先天免疫
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