慢速英语:研究表明病毒引起儿童麻痹性疾病

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antibodies – n. substances produced by the body to fight disease

germ – n. a very small living thing that causes disease

immune – adj. not capable of being affected by a disease

outbreak – n. a sudden start or increase of fighting or disease

paralyze – v. to make a person or animal unable to move or feel all or part of the body

spinal – adj. of, relating to, or affecting the spine