要更清晰地了解何时使用扫描程序与何时使用 AST 之间的差别，请考虑清单 10 中的代码。

To see more clearly, this distinction of when you would use a scanner vs. an AST, consider the code in Listing 10.

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这种放射示踪剂是一种具有放射活性的复合物，具有注射安全且扫描显示清晰的优点。

A radiotracer is a radioactive compound that is safe to inject into patients and shows up clearly on a scan.

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轻触下载按钮，你的IPHONE可以变成长笛，魔术道具，高清晰的收音机，吉他调音器，警方录音扫描仪和其他多达十五万的东东。

With the tap of a download button, your iPhone can become a flute, a medical device, a high-definition radio, a guitar tuner, a police radio scanner and 150, 000 other “things.”

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