老师们还报告说，这些学生更难集中注意力。
Teachers also reported that these students had more difficulty paying attention.
正因如此，一些人认为在无聊的课堂上涂鸦可以帮助学生集中注意力。
Because of this, some believe that doodling during a boring lecture can help students pay attention.
学生要能从多种参考资料中作出选择，把注意力集中在其中一种上。
Students should be able to make a selection from a range of reference materials and focus their attention on one of them.
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