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space-reflection symmetry

n.
1.(physics) parity is conserved in a universe in which the laws of physics are the same in a right-handed system of coordinates as in a left-handed system

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    Idiom of the Day

    in one's spare time
    in one's free time
    My cousin likes to fix old clocks in his spare time.



    1.
    He's very sensitive, so people walk on ________ when he's around.

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