For even bigger machines, Let's look at Crossrail tunneling machines.

对于更大的机器，我们来看看 Crossrail 隧道掘进机。

Most tunnel boring machines are  normally around 17 metres in diameter.

大多数隧道掘进机的直径通常在 17 米左右。

In 2010, a massive tunnel-boring machine began its work underneath 92nd Street.

2010 年，一台大型隧道掘进机开始在 92 街地下工作。

I think we need to have at least a tenfold improvement

所以，是的，隧道掘进通常非常困难。

To solve this problem, during the next close approach, a tunnel boring  machine is transported to Mars.

为了解决个问题， 在下一次接时，一台隧道掘进机被运送到火星。

Indian officials say they're considering alternative methods to rescue 41 construction workers from a collapsed tunnel after the blades of the drilling machine became stuck in the debris.

印度官员表示正在考虑用其他方法从倒塌的隧道中救出 41 名建筑工人，此前掘进机的刀片卡在塌方体中。

With an excavation diameter of 16.07 meters and a length of about 145 meters, the 4,500-tonne shield-tunneling machine adopted in the project is independently designed and made by Chinese enterprises.

项目采用的 4500 吨盾构掘进机开挖直径 16.07 米，长约 145 米，由中国企业自主设计制造。

And just a few years after that, in  2020, the company was using its own specialised tunnel boring machine to carry  out what is an unusually narrow excavation.

就在那之后的几年，也就是 2020 年，该公司使用自己的专用隧道掘进机进行异常狭窄的开挖。

But above this gate, and behind it even to the mountains, he piled the thunderous towers of Thangorodrim, that were made of the ash and slag of his subterranean furnaces, and the vast refuse of his tunnellings.

但是在扇门的上方，甚至在它后面的山上，他都堆起了坦哥罗德里姆的雷鸣般的塔楼，些塔楼是用他的地下熔炉的灰烬和炉渣，以及他的隧道掘进机的大量垃圾建造的。