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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

    shoot straight
    to act fairly, to deal honestly with others
    The salesman always shoots straight when he is dealing with his customers.



    1.
    Our leading actor is unable to come on the stage at the moment because he is ________ with emotion.

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