慢速英语:新的面部识别系统旨在识别戴口罩的人

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mask – n. something that covers part of all of the face

artificial intelligence – n. the development of computer systems with the ability to perform work that normally requires human intelligence

channel – n. a way of communicating or getting something done

surveillance – n. the activity of watching people carefully, often secretly, especially by an army or police force

ensure – v. to make sure something is done of happens

track – v. follow the movements of a person or thing

key – adj. very important in influencing or achieving something

tough – adj. difficult