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rayleigh disk

n.
1.an acoustic radiometer consisting of a light disk suspended from a quartz thread

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    Idiom of the Day

    look like a million dollars
    to look well and prosperous, to appear healthy and happy
    My uncle looked like a million dollars when I saw him at the party last weekend.



    1.
    Choose an idiom to replace the expression in the brackets:
    The man has been (rushing here and there) all day.

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