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	atonement atop -ator A to Z at-risk atrium atrocious atrociously atrocity atrophy AT&T attaboy attach attachment attaché attaché case attack attack ad attacker attagirl attain attainable attainment attempt Attenborough, Sir David

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