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supercritical

adj.
1.(especially of fissionable material) able to sustain a chain reaction in such a manner that the rate of reaction increases

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    Idiom of the Day

    drop back
    to move or step backwards, to retreat
    During the hike my foot began to get sore so I decided to drop back and rest for awhile.



    1.
    Play the tape back as many times as you like and ________ everything that the native speaker has said.

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