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。

Boring machines weighing up to 1,300 tons drilled at nearly 3.5 meters per hour.

重达 1,300 吨的钻孔机以每小时近 3. 5 米的速度钻孔。

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。