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f number

n.
1.the ratio of the focal length to the diameter of a (camera) lens system

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    Idiom of the Day

    hit the road
    to leave
    We should hit the road early tomorrow morning if we want to reach the seashore before evening.



    1.
    The reason for this is possibly that you thought it was a ________ but in fact it is a tragedy.

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    The external tank on space shuttles is not painted. It is the only part of the shuttle that is lost after launch, so it is not necessary to worry about metal corrosion.      .. More >>
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