单词	focal length
释义	focal lengthˈfocal length noun [countable] technical Examples EXAMPLES FROM THE CORPUS A single focal length, fixed-focus is often sufficient. Properties of a parabola All parabolas are similar. Focal length a determines the magnitude. The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine. the distance between the centre of a lens and the focal point
随便看	seducer seduction seductive seductively seductress see seed seedbed seed capital seed corn seedless seedling seed money seed pearl seedy seeing Seeing Eye dog seek seeker seem seeming seemingly seemly seen seep

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