慢速英语:当选总统拜登选出五角大楼首位非裔领导人

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waiver – n. an official document indicating that someone has given up or waived a right or requirement

staff – n. a group of people who work for an organization or business

superb - adj. excellent or brilliant in a very noticeable way

mask - n. a covering used to protect your face or cover your mouth

distribution - n. give something out to people

dose - n. an amount of a medicine to be taken at a given time