（1）A scientific discovery is often made long before someone is able to 1 .
（2）The word laser 2 “light amplification by stimulated emission of radiation.”
（3）The light from a laser is called 3 light because it is light that moves in only one direction.
（4）4 applicationstremendouscoherentconcentrateddiscolorationsIncoherentleaving behindput it to usestands forsurgerylight, like the light from the sun or a light bulb, moves away from its source in all directions, so its strength is very spread out.
（5）The light from a laser, moving in only one direction and 5 in a narrow beam, is much stronger.
（6）As soon as the laser was developed, scientists began thinking of practical 6 for it.
（7）Lasers can be used in 7 to open and close incisions with on danger of infection.
（8）A laser beam can completely destroy a cancerous growth without 8 any dangerous cancer cells that could start a new tumor.
（9）More recently, lasers have been used to remove skin 9 like freckles, age spots, and birthmarks.
（10）Over the past twenty years, personal computers have brought 10 changes to the home and the workplace, and many of the most important developments in computer technology are based on lasers.__6__(完形填空)
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