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chlorine

noun
/ˈklɔːriːn/
/ˈklɔːriːn/
[uncountable]
(symbol Cl)
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  1. a chemical element. Chlorine is a poisonous green gas with a strong smell. It is often used in swimming pools to keep the water clean.氯;氯气Topics Sports: water sportsc2, Physics and chemistryc2
    Word Originearly 19th cent.: named by Sir Humphrey Davy, from Greek khlōros ‘green’ + -ine.

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