This is the premise of Edwin Abbott's 1884 novella, Flatland.

这就是埃德温·艾勃特1884年的中篇小说《平面国》中的假设。

One day a sphere shows up in Flatland to visit our square hero.

有一天，一个球体出现在平面国中，拜访我们的正方形男主角。

And like other Flatland cities, Atlanta never saw much of a housing price surge.

跟其它平地城市一样，亚特兰大过去也从未出现过房屋价格的巨幅波动。

This is where Flatland can help us. Let's look at our square protagonist's world.

这就是平面国可以帮助我们的地方。让我们来看一下正方形主角的世界。

But in Abbott's Flatland, closer objects are brighter, and that's how they see depth.

但是在艾勃特的《平面国》中，距离更近的物体更加明亮，这就是它们如何察觉深度的。

But here, perhaps, some of my younger Readers may ask HOW a woman in Flatland can make herself invisible.

但在这里，也许我的一些年轻读者可能会问，如何在平地妇女可以使自己无形。

Well, that is just what we see when one of our triangular or other acquaintances comes toward us in Flatland .

那么，这就是当我们在平面国，遇到一个三角形先生或者其他的熟人朝我们走来时，所能看到的一切。

Here's what it looks like when the sphere passes through Flatland from the square's perspective, and this blows his little square mind.

这是当球体经过平面国时看起来的样子。从正方形的角度来看，这完全颠覆了它小小正方形的观念。

Flatland is a fun, mathematical thought experiment that follows the trials and tribulations of a square exposed to the third dimension.

平面国是一个有趣的数学思想实验，叙述一个正方形在历经第三维度的时候遇到的种种考验与磨练。

Due to the restrain of the steep terrain, the construction expenditure of highway in mountainous areas is far more costly than that in the flatland.

由于地形受限，导致了山区高速公路的工程造价远远高于平原区高速公路。