rainfall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.

Cities that get more rainfall than Seattle include Huston, Memphis, Nashville, and pretty much every major city on the eastern coast, such as New York, Boston, and Miami.

In fact, Seattle ranks 44th among major US cities in average annual rainfall.

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

Lack of rainfall resulting from global warming.

Biologist Jill Farrant of the University of Cape Town in South Africa says that nature has plenty of answers for people who want to grow crops in places with unpredictable rainfall.

But rainfall can revive them in a matter of hours.

When a tree first starts growing in a certain area, it's likely that the 27 climatic envelope—the temperature, humidity, rainfall patterns and so on—suits it.

The chemical composition of rainfall changes slightly as rain clouds move.