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 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。

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中救出 41 名建筑工人，此前掘进机刀片卡在塌方体中。

But whereas modern tunnel boring machines are enormous pieces of kit, his involved an iron framework within which two rows of five miners stood, and the miners scraped away at the earth ahead of them.

然而， 现代掘进机是庞大设备，而布鲁内尔盾构机则是一个铁框架， 里面有两排各名矿工站立，他们用工具刮掉前方泥。

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.

就在那之后几年，也就是 2020 年，该公司使用自己专用掘进机进行异常狭窄开挖。

Each TBM will be up to 140 meters long (459 ft) weigh roughly 1000 tonnes, and have an exterior diameter of 7.1 meters.

每台掘进机长度将达到140米（459英尺）， 重量约为1000吨，并且外径为7.1米。

But you want this machine that can continuously bore the tunnel and build up the tunnel behind it as it's going through.

但你想要是一台能够持续掘进，并在前进过程中不断建造机器。

He could only cling to its back, expecting to be shaken off at any moment when he heard Hermione yelling, Defodio!

他只能紧紧抓住它背， 随时准备着听到赫敏大喊“掘进三尺！ ”时被甩下去。

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

为了解决这个问题， 在下一次近距离接近时，一台掘进机被运送到火星。

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.

但是在这扇门上方，甚至在它后面山上，他都堆起了坦哥罗德里姆雷鸣般塔楼，这些塔楼是用他地下熔炉灰烬和炉渣，以及他掘进机大量垃圾建造。

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

大多数掘进机直径通常在 17 米左右。

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

对于更大机器，让我们看看横贯铁路掘进机。

I think we need to have at least a tenfold improvement

所以，是，掘进通常非常困难。