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biosafety level 4

n.
1.exposure to exotic infectious agents that pose a high risk of life-threatening disease and can be transmitted as an aerosol and for which there is no vaccine or therapy

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    Idiom of the Day

    a Mecca for (something)
    a place that is popular with people for some reason (from the city of Mecca which is the religious center of Islam)
    The area with many lakes is a Mecca for people who like to fish.



    1.
    Choose an idiom to replace the expression in the brackets:
    Our plans failed and we had to go (back to the beginning).

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