慢速英语:研究表明T细胞在对抗新冠病毒方面很重要

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immunity–n. to be unaffected by a disease

negative–adj. a bad reaction

exposed–adj. to be out in the open or available

response–n. an answer or reaction to something

sample–n. a test amount

potentially–adv. possibility

encouraging–adj. a positive sign

optimal–adj. in the best case