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	negation negative negative equity negatively negativity negawatt neglect neglectful neglectfully negligee negligence negligent negligently negligible negotiable negotiate negotiation negotiator Negress Negro Negro spiritual Nehru, Jawaharlal neigh neighbour neighbourhood

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