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chain reaction

n.
1.a series of chemical reactions in which the product of one is a reactant in the next
2.a self-sustaining nuclear reaction

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    Idiom of the Day

    punch a hole in (something)
    to make a hole in something
    I used a hole puncher to punch a hole in the sheet of paper.



    1.
    S1: Frozen foods are so popular today that many people wonder how they ever lived without them.
    S6: Now refrigerators and deep freezers preserve many foods that could not be kept any other way.

    P: Near the North Pole, where the ground stays frozen all the year around, there is no problem ,of preserving foods.
    Q: Actually, people who live in cool climates.have had frozen foods for a long time.
    R: Ice helped them when they could get it, -but they couldn't get,it very often.
    S: But people who live in warm climates have not always been able to keep food fi-esh.

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