Results: The shape of SOF changed from isosceles triangle in the stage of newborn to acute triangle by the stage of 7 years.
结果：小儿SOF随年龄的增长，形状由等腰三角形向锐角三角形演变。
Obtuse triangle: One of the three angles is an obtuse Angle. The other two are acute angles.
钝角三角形：有一个角是钝角，有两个角是锐角。
Right triangle: One of the three angles is a right Angle. The other two are acute angles.
直角三角形：有一个角是直角，有两个角是锐角。
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