The four dimensional space, means that the mankind the substance space( namely three dimensional space ) of the concrete activity, plus one more consciousness measurement ( time factor).

四维空间，是指在人类具体活动的实质空间（即三维空间）之上，再加上一个瞬间取向的知觉量度（即时间因素）。

youdao

On the next rung up the ladder of difficult mathematics comes doing the same thing in four-dimensional space.

在这个困难的数学阶梯上取得下一个进展之前，得先在四维空间做同样的事情。

youdao

Zinovyev and Gorban then plot this data in four-dimensional space.

然后兹诺瓦·耶夫与戈班在四维空间中对这些数据进行绘制。

youdao

On the next rung up the ladder of difficult mathematics comes doing the same thing in four-dimensional space.

ECONOMIST: Proof of the truth of the Poincar�� conjecture

Einstein's theory of relativity unified these and created a four-dimensional space that is an analogue to our three-dimensional space, except that the "distance" between two points need not be positive.

WSJ: Book Review: Surfaces and Essences

Now imagine this happening in the four-dimensional fabric of space and time.

NPR: Einstein: Relatively Speaking, a Complicated Life