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师:老师为每个同学准备了两个圆形纸片,下面我们就用这两张纸片研究一个问题。请大家拿出其中一张圆形纸片,你能用阴影表示出它的1/2吗?
Teacher: The teacher prepared two circular pieces for each classmate. Now let’s study a problem with these two pieces of paper. Please come up with one of the round paper, you can use the shadow to indicate its 1/2?