Many medical and scientific employees have to work with machines that release radiation. Because of this, they wear badges that change color when they get too much radiation.

• 有很多医药或科技工作者经常要接触到具有放射性的物质,因此,他们就需要佩戴辐射检测标识,当他们接触的辐射超标,标识的颜色就会改变。