Englishfor English speakers
chlorine
Noun
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A chemical element (symbol Cl) with an atomic number of 17.
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Chlorine can mean something that contains chlorine, but is not chlorine as an element
Drinking water and swimming pool water is chlorinated to make it clean.
system
Noun
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A group of things that work together; a way of doing something.
This coloured paper is part of my system for keeping lists of people.