This is called natural background radiation.
这称为自然环境辐射。
These levels of natural and background radiation is normal.
但这些都只是正常辐射。
The unwanted radiation is referred to as background radiation.
这种有害辅射称为背景辅射。
Possibly we are accustomed, biologically speaking, to this background radiation.
从生物机理上说，我们可能已经习惯了这种本底辐射。
This cosmic microwave background radiation, they said, represents the ancient afterglow of the big bang.
他们说，这宇宙微波背景幅射代表着宇宙大爆炸的余辉。
Also everyone is given a special counter to analyze the radiation background.
另外每个人都有一个专柜，分析辐射背景。
Also everyone is given a special counter to analyze the radiation background.
另外每个人都有一个专柜，分析辐射背景。
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