Charles Bridge is a medieval stone arch bridge that crosses the Vltava River.

查理大桥是一座横跨伏尔塔瓦河的中世纪石拱桥。

To explain that, we need to do a quick lesson on arch bridges.

为了解释这一点，我们需要快速学习一下拱桥。

When the arch is below the roadway, we call it a deck arch bridge.

当拱位于路面下方时，我们称其为上承式拱桥。

You will visit the Green Dragon Pub, the mill, the double arch bridge, and the famous Feast Tree.

您将参观青龙酒馆、磨坊、双拱桥和著名的宴树。

So, arch bridges normally need strong abutments at either side to push against that can withstand the extra horizontal loads.

因此，拱桥通常需要两侧有坚固的桥台来推动，以承受额外的水平荷载。

Tied arch bridges don't transfer thrust forces to their supports, meaning they can sit atop piers designed primarily for vertical loads.

系杆拱桥不会将推力传递到其支架上，这意味着它们可以坐落在主要为垂直荷载设计的桥墩顶部。

Instead of beams that are loaded perpendicularly, arch bridges use a curved element to transfer the weight of the bridge to the substructure using almost entirely compressive forces.

拱桥不是垂直加载的梁，而是使用弯曲元件， 几乎完全利用压缩力将桥梁的重量转移到下部结构。