In 2d ultrasound, a flat image of the baby is produced.

在2d超声、被生产婴儿的平面图像。

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You can also set up three-dimensional textures, using shapes instead of a flat image.

你还可以设定三维的纹理，使用形状替换平面的图像。

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You can also set up three-dimensional textures, using shapes instead of a flat image. Unfortunately, these do not currently work very well across different platforms.

你还可以设定三维的纹理，使用形状替换平面的图像。不幸的是，这些操作目前还不能很好地跨平台实现。

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The artist draws an image with oily ink onto a piece of stone or other flat surface.

VOA: special.2009.09.02

One of the hands keeps a flat hand shape and it just kind of lightly moves back and forth as if it were a flickering image on a screen."

VOA: special.2011.04.13

Playing a 3D game on the gadget is far more compelling than staring at a flat image.

FORBES: Nintendo 3DS Could Be 2011's Most Important Gadget

Playing a 3-D game on the gadget is far more compelling than staring at a flat image.

FORBES: Magazine Article

Using a lens with too long a focal length, for instance, makes the image appear flat.

ECONOMIST: Animation takes on a whole new reality