一辆装有爱克斯光安检仪的面包车长期停放在入口处,所有进入酒店的客人必须把携带的包袋放到车上通过检查。
A van with an X-ray security checkpoint was permanently parked outside the entrance. All visitors entering the hotel needed to pass their bags through the van first.
顺便提一下,大家可能想问:排队等待安检的普通旅客能看出这两种扫描仪的区别吗?
By the way, you might be wondering: Can the average traveler standing in a security line tell the difference?
于是他反向推算了一下扫描仪生成符合机场安检要求的图像所需的X射线剂量。
He calculated backward to figure out how big an X-ray dose would be needed to get the kind of images the machines produce.
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