I understand that it will take three years longer and cost more money to build the South Island Line underground.

我理解这样，将会增加三年的建造时间，成本也会因此上升。

youdao

Power is fed into the electricity line through an underground cable.

电力通过地下电缆传输给这条电线。

《牛津词典》

The electricity line is fed with power through an underground cable.

这条电线的电源是通过地下电缆传输的。

《牛津词典》

Artist Luzinterruptus fitted 10, 000 books that had been discarded by public libraries with LED lights and covered the streets of Melbourne with them, and in an exciting development the much-anticipated Low Line underground park in NYC debuted a full-scale model of their incredible fiber-optic solar-concentrating technology in New York City's lower east side.

ENGADGET: Inhabitat's Week in Green: GPS shoes, shape-shifting bicycle and a wheelchair helicopter

The problem with HS2 for Ealing, in west London, was the line followed the route of the London Underground Central Line.

BBC: HS2 scraps Ealing bridge demolition plan for tunnelling

It is the first orbital rail route for London since the Circle Line on London Underground was built in 1884.

BBC: London