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VOA慢速英语:研究称观看在线视频的孩子数量4年内翻了一番
2019-11-07来源:和谐英语
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survey – n. examinations of people's opinions based on asking questions
screen – n. the usually flat part of a computer or device that shows images and text
stream – v. listen or watch something on a computer or device
track – n. follow the movement of
certain – adj. completely sure of something
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