It may be necessary to stop（）(每隔一定时间) in the learning process and go back to the difficult points in the lessons.
出自：教师招聘考试（中学英语）学科专业知识
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It may be necessary to stop（）(每隔一定时间) in the learning process and go back to the difficult points in the lessons.
出自：教师招聘考试（中学英语）学科专业知识