Roman qanat tunnels were constructed with vertical shafts dug at intervals of between 30 and 60 meters.

古罗马坎儿井隧道是用每隔 30 到 60 米开挖的竖井建造的。

It was used to cut through high mountains when the qanat method was not a practical alternative.

当坎儿井方法不可行时，它被用来穿越高山。

Remarkably, some qanats built by the Persians 2,700 years ago are still in use today.

值得注意的是，波斯人在 2700 年前建造的一些坎儿井至今仍在使用。

The qanat construction method was usually faster than the counter-excavation method as it was more straightforward.

qanat 施工方法通常比反开挖方法更快，因为它更直接。

They later passed on their knowledge to the Romans, who also used the qanat method to construct water-supply tunnels for agriculture.

后来他们将知识传授给了罗马人，罗马人也使用坎儿井法建造了农业供水隧道。

He tried to think of moisture in the air—grass covering this dune … open water somewhere beneath him, a long qanat flowing with water open to the sky except in text illustrations.

他试着想象空气中的湿气——草覆盖着这个沙丘… … 在他脚下某处开阔的水域，一条长长的坎儿井， 水流向天空开放， 除了文字插图。