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nitrification

n.
1.the chemical process in which a nitro group is added to an organic compound (or substituted for another group in an organic compound)
2.the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)

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    Idiom of the Day

    tied up
    to be busy
    I was tied up yesterday and did not have enough time to telephone my friend.



    1.
    We threw out some old furniture (a) / so that the new television set (b) / has enough space. (c) / No error (d)

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