慢速英语:世卫组织发布儿童佩戴口罩指南
日期:2020-08-26
Words in This Story
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