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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	premonitory prenatal prenatally prenuptial agreement preoccupation preoccupied preoccupy preoperative preordained pre-owned prep prep. prepackaged prepacked prepaid preparation preparatory preparatory school prepare prepared preparedness prepay pre-pay prepayment preponderance

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