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concave

adj.
1.curving inward

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  • Idiom of the Day

    grace (someone or something) with one's presence
    to honor someone or something by being present
    The Queen graced the opening of the hospital with her presence.



    1.
    Choose an idiom to replace the expression in the brackets:
    If the boy does not study hard he will (fail to keep up with) the other students.

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    Unit
    Unit : part per million (ppm)
    Formula : 1.00E-06
    in si : 1.00E-06
    si unit : 1
    in cgs : 1.00E-04
    cgs unit : %
    Category : percentage.      .. More >>
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