荧光材料最大的好处是无放射性，但是其发光时间短，随着储存的能量释放，亮度迅速减弱。
Their freedom from radioactivity and its potential hazards was a great advantage, but their glow tended to be short-lived, fading rapidly as the stored light-energy was discharged.
荧光材料最大的好处是无放射性，但是其发光时间短，随着储存的能量释放，亮度迅速减弱。
Their freedom from radioactivity and its potential hazards was a great advantage, but their glow tended to be short-lived, fading rapidly as the stored light-energy was discharged.
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