1. The scanning laser beam was an ideal device for reading these markings, and so the Universal Product Code was born.
    能进行扫描的激光是一阅读这些标志的理想手段，因而通用条形码便应运而生了。

2. At the meeting I sat restlessly, scanning each comfortable mother's face, trying to determine which one hid the secret of Charles.
    开会时，我不安地坐着，扫视着每一位母亲安详的脸，想确定哪一张脸能解开有关查尔斯的秘密。

3. Another advance, a computer-controlled brain scanning device, has led to a second discovery by those seeking the biological component of mental abilities.
    另一进展，一台计算机控制的脑部扫描仪，使得寻找思维能力的生理因素的研究人员有了第二个发现。