preschool chelloldren
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市场上的许多iPhone应用程序都是直接面向学前儿童的，许多程序都贴上了“教育”标签，例如“学步幼童趣味挑战题：形状”，这种程序让小孩点击圆圈、正方形或三角形；
Many iPhone apps on the market are aimed directly at preschoolers, many of them labeled "educational, " such as Toddler Teasers: Shapes, which asks the child to tap a circle or square or triangle;
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