找一些安静、稳定的东西，一台低音的小风扇，一只电子手表或钟是一个很好的选择。
Find something that makes a very quiet, steady sound. A small fan on a low setting or a real, non-electric, ticking watch or clock are ideal.
二十世纪七十年代，这些发着红光的二极管在太空时代被广泛使用，它出现在收音机闹钟，袖珍计算器以及电子手表上。
The first ones to come into wide use—glowing a space-age red—turned up in the clock radios, pocket calculators, and digital watches of the 1970s.
几乎每种电子设备，小到电子手表、计算机，大到计算机、通信设备、军用武器系统，只要存在电子元器件，它们之间的电气互连就要使用印制电路板。
It is one of the important components of electronic products. For almost every electronic equipment, electrical interconnection between them must use printed circuit boards.
几乎每种电子设备，小到电子手表、计算机，大到计算机、通信设备、军用武器系统，只要存在电子元器件，它们之间的电气互连就要使用印制电路板。
It is one of the important components of electronic products. For almost every electronic equipment, electrical interconnection between them must use printed circuit boards.
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