underground是什么意思？

Millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.

millions of irrigation wells in many countries are now pumping water out of underground sources faster than rainfall can refill them.

Some animals grow thicker fur, or live in tree holes or underground to stay warm.

There's a high-tech underground trash disposal system.

Unless renewables become cheap enough that substantial carbon deposits are left underground for a very long time, if not forever, the planet will likely be exposed to potentially catastrophic climate risks.

Right into the early 20th century, kitchens were smoky, noisy places, generally located underground, or to the back of the house, and as far from living space as possible.

Stored underground in large salt caves in Louisiana, this stockpile is called the Strategic Petroleum Reserve, and currently contains over 600 million barrels of oil, roughly equivalent to one month's supply.

As a measure to counter future shortages, the American government decided to establish a stockpile of oil in caves underground

It then ships the gas 200 miles by pipeline to Canada, where it is pumped underground in oil recovery operations.

But once these plants use up their stored reserve or tap out the underground supply, they cease growing and start to die.

right into the early 20th century, kitchens were smoky, noisy places, generally located underground, or to the back of the house, and as far from living space as possible.