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optic axis

n.
1.a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted

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    Idiom of the Day

    in the same boat
    in a similar situation
    We are all in the same boat now that our store has gone out of business.



    1.
    When we eventually arrived at the hotel, we had to ________ our luggage at reception.

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    A common cure for all kinds of illnesses in the past was ‘bleeding' the patient. This could be done by the doctor making a small cut and putting a hot cup over the wound to suck out blood, or by putting blood-sucking leeches on the skin. Using leeches is being reintroduced by some western doctors.      .. More >>
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