In a 3-D film or picture, the objects look real and solid instead of looking like a normal flat picture.

in 3-D The picture looks great because it's in 3-D. 这张相片看起来很棒，因为是三维立体的。

a 3-D effect 三维立体效果

These computer games rely on 3-D graphics. 这些电脑游戏都依靠三维成像技术。