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NL888 Posted 12 years ago
Grammar

It's been decades? What does it mean?

Does "It's been decades" mean "The Colorado river has been decades in dusty smear (since it has reached the sea)"?

Context:

A historic US-Mexico deal will see 130 billion litres of water infuse the river's parched delta, leaving an explosion of life in its wake
FROM above it looks like a meandering yellow scar. On either side lie lush green polygons – the irrigated fields of the Mexicali valley just south of the US border, where tomatoes, cucumbers and onions grow in what should be a desert. The dusty smear running in between used to be the Colorado river. It's been decades since it has reached the sea.

MOre:
http://www.newscientist.com/article/mg22129602.800-huge-water-pulse-to-bring-colorado-river-back-from-dead.html
  

Top answer

It has been decades since the river reached the sea.

  • It has been decades since the river reached the sea.
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3 Answers
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It has been decades since the river reached the sea.
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What does it refer to? Dusty smear in the former Colorado River riverbed?
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It's a colourful way of saying that there is no, or almost no, water left in the river.
It's not a common phrase. The author has invented it..

Clive

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