名词
中文翻译：适应性免疫
同义词：
['acquired immunity', 'acquired resistance', 'adaptivedefense']
例句：
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1. The immunesystem is the body's first lineof defense against infections.
免疫系统是身体对抗感染的第一道防线。
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2. Infections can causea person to develop an adaptive immunity.
感染可能导致一个人发展出适应性免疫。
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3. Adaptive immunity is crucial for survival in environmentswith high levels of pathogens.
适应性免疫对于在病原体水平高的环境中生存至关重要。