VOA慢速英语:Scientists Warn of Threat to Coastal Reefs

coral – n.  hard material formed on the bottom of the sea by the remains of small creatures    

coral reef –adj. and n. a long line of coral that lies in warm, shallow water

kelp – n. a kind of brown seaweed

proxy - n. a person who is given the power to do something.  

composition – n. the combination of parts or elements that make up something -

coarse – adj. made up of large pieces; not fine

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