慢速英语:接种疫苗的美国老年人开始恢复正常生活

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nails –n. (pl.) the hard covering at the end of a finger or toe

senior (citizen) –n. an older person who is near, at or older than retirement age

hug –v. to put your arms around someone to show love or friendship

resident –n. a person who lives in a particular place

caution –n. care taken to avoid danger or risk; a careful way of behaving