A photograph is a translation of a scene onto a two-dimensional surface.
照相就是把场景转换到二维表面上。
Because a surface is a two-dimensional object, that will end up being a double integral.
由于表面是二维的，所以结果是二重积分。
Because a surface is a two-dimensional object, that will end up being a double integral.
由于表面是二维的，所以结果是二重积分。
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