Until now, this technique could only be used to manufacture two-dimensional objects.

到目前为止，该技术还只能用于构建二维的结构。

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Another realistic touch was using three-dimensional objects on the set, like rocks and bushes as opposed to two-dimensional painted scenery.

另一种现实主义手法是在布景中使用三维物体，如岩石和灌木，而不是二维绘制风景。

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Finally, three-dimensional objects are displayed on a two-dimensional screen.

最后，三维对象被显示在二维屏幕上。

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Tiny carbon tubes can be used to hide three-dimensional objects from view, according to a team of researchers.

BBC: Carbon nanotubes experiment results

Creating two dimensional representations of three dimensional objects requires a leap of abstraction.

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But so is verifying anyone's identity in a world where even three-dimensional objects like Stradivarius violins can easily be "printed", let alone copied en masse.

ECONOMIST: Fake ID cards