| 单词 | laser pen |
| 释义 | > as lemmaslaser pen laser pen n. (a) a small, slender hand-held device emitting a laser beam, used for scanning bar-codes; (b) a hand-held device emitting a narrow beam of coloured light, typically used by speakers to project a visual pointer on to a screen. ΘΚΠ the world > matter > physics > electromagnetic radiation > light > laser > [noun] laser1960 ruby laser1960 laser gun1961 injection laser1963 phaser1966 dye laser1967 excimer laser1973 laser pen1981 1981 Industry Week 26 Jan. 101 The computer system, now being used to track 200,000 pending patent applications, uses bar-code labeling of files and a laser pen scanner to provide input. 1992 AVC Presentation for Visual Communication (Nexis) Feb. 20 Weighing under three ounces with batteries and disguised as a pen, the Laser Pen will operate up to seven hours at distances up to 65′. 1997 Daily Tel. (Electronic ed.) 10 Nov. Jack Straw, the Home Secretary, is to be urged to crack down on laser pens after three police officers suffered eye injuries during a siege. The officers complained of burning eyes and headaches after a pen was aimed at them. 2002 Record (Bergen County, New Jersey) (Nexis) 13 Feb. i1 Most other libraries use a laser pen to scan a bar code when someone wants to check out a book, and the computer keeps track of when it's due back. < as lemmas |
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