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VOA慢速英语:世卫组织发布儿童佩戴口罩指南
2020-08-26来源:和谐英语
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mask – n. a covering used to protect your face or cover your mouth
underlying – adj. used to identify the idea, cause, problem, etc., that forms the basis of something
transmission – n. the act or process by which something is spread or passed from one person or thing to another
teenager – n. a person between 13 and 19 years old
solely – adv. only or just
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