This complicated fluxion must be described with two dimensions or three dimensions.

这种复杂的流动状态需要用二维或三维来描述。

youdao

When each eye sees very similar, but different versions of an image, the brain thinks it is seeing depth, or three dimensions.

VOA: special.2010.01.26

Then next week we'll do more complicated problems that involve motion in higher dimensions, how to go to two dimensions or three dimensions.

下周我们将会处理更复杂的问题,包括更高维数的物体运动,如何处理二维以及三维运动

耶鲁公开课 - 基础物理课程节选