名词
中文翻译：致热原
同义词：
['pyrogen', 'pyrogenous', 'pyrogenic']
例句：
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1.The bacteria that cause pneumonia is a pyrogen.
引起肺炎的细菌是一种致热原。
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2. The vaccine contains a pyrogen to stimulate the immune system.
疫苗含有一种致热原来刺激免疫系统。
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3.The patient developed a fever after receiving the pyrogen injection.
患者在接受致热原注射后出现了发热。