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gregorian telescope

n.
1.a reflecting telescope that has a paraboloidal primary mirror and a hyperboloidal secondary mirror

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    Idiom of the Day

    break off (something) or break (something) off
    to discontinue something, to terminate something
    The two countries broke off their relations.



    1.
    My brother has been (a) / living in America(b) /with his family (c) /forthe past ten years. (d) / No error (e)

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