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valency

n.
1.the phenomenon of forming chemical bonds
2.(biology) a relative capacity to unite or react or interact as with antigens or a biological substrate
3.(chemistry) a property of atoms or radicals

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    Idiom of the Day

    mark time
    to wait for something to happen
    My friend has been marking time for over a month now as he waits to hear about the new job.



    1.
    Choose an idiom to replace the expression in the brackets:
    The company decision to transfer me hit me (very hard).

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    Invention
    Invention : videotape
    Year : 1950s
    Inventor : charles ginsburg
    Country : us.      .. More >>
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