平均每个美国人每年接收360毫雷姆的射线，其中300毫雷姆来自自然放射源，60毫雷姆来自人类活动(雷姆是射线强度单位)。
The average American receives 360millirems of radiation each year, 300 from natural sources and 60 from man-made activities. (a rem is a unit of radiation exposure.)
这是一种伤害很大的激光射线，能给敌人的建筑单位造成非常大的伤害！
It is a very powerful bream that can really do a lot of damage to enemy buildings.
方法对宜宾市202家医疗单位医用X射线机房的辐射防护水平进行现场测定，对从业人员外照射个人剂量进行现场调查。
Methods We inspected the level of radiation protection of medical X-ray rooms in 202 medical institutes of Yibin city and the personal dosage of those who worked in X-ray rooms.
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