该机器由两个人操作：一个人带着乘客走过该扫描仪，他全程看不到图像；另一个人只能埋头检查图像，不能抬头看乘客。
Two officers work the scanner -- one leads the passenger into it, and never sees the images; the other takes and examines the image, but never sees the passenger.
该机器由两个人操作：一个人带着乘客走过该扫描仪，他全程看不到图像；另一个人只能埋头检查图像，不能抬头看乘客。
Two officers work the scanner -- one leads the passenger into it, and never sees the images; the other takes and examines the image, but never sees the passenger.
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