This is called natural background radiation.
这称为自然环境辐射。
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。
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。
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。
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