ONLINE learning is popular nowadays. Students watch educational videos to learn. But sometimes the videos are so long that students lose interest. Then how long should videos last? A survey in the US shows that a short video can be more effective than a long one.
21世纪报社版权所有，未经书面授权，禁止转载或建立镜像。 主办单位：中国日报社 Copyright by 21st Century English Education Media All Rights Reserved 版权所有 复制必究 京ICP备13028878号-12京公网安备 11010502033664号
京公网安备 11010502033664号
