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  3. Have you heard about new compact Discs? They’re the latest invention from Sony. A CD consists of a piece of aluminium coated wit

Have you heard about new compact Discs? They’re the latest invention from Sony. A CD consists of a piece of aluminium coated wit

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问题     Have you heard about new compact Discs? They’re the latest invention from Sony. A CD consists of a piece of aluminium coated with transparent plastic，12 cms across，for producing sound.  
    It’s similar to an ordinary record，except that it’s read by a laser beam，and the information recorded on the aluminium is digital.  
    The makers claim that a CD can reproduce the original sound perfectly，without any distortion or background hiss. As the system is computerized，there’s no loss of quality between the studio master and the record you buy.  
    Also，a CD is much tougher-than a vinyl(乙烯基)record，so it doesn’t need such careful handling. Dust and dirt won’t damage it，and as there’s no contact between the laser and the disc, it will never wear out.
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答案 你听说过一种新式坚实的圆盘吗? 它们是索尼公司的最新发明。这种小型薄圆盘是一块直径为十二厘米的铝片，表面涂上一层透明的塑胶用以播出声音。它以数字形式把信息记录在铝片上，并且用激光来解读，除此之外，它和普通的唱片很相似。 制造商宣称这种唱片能够完美地再现原声，不会失真，也不会带有任何伴随的嘶嘶声。由于制造系统完全由计算机控制，你所买的唱片和录音室里制作的母片的质量毫无差别。 另外，这种激光唱片比乙烯基唱片坚固得多，所以使用时不需十分小心。灰尘和污物都不会对它造成损害，又由于激光和铝片之间没有接触，它将永无损耗。
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