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1·This is called natural background radiation.

这称为自然环境辐射。

2·These levels of natural and background radiation is normal.

但这些都只是正常辐射。

3·No more background radiation black holes or Mars robots.

不要再讲关于黑洞辐射或者火星机器人的事情了。

4·The unwanted radiation is referred to as background radiation.

这种有害辅射称为背景辅射。

5·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。

6·But natural background radiation is more than 100,000 times the highest levels detected.

但其检测量大大高于自然本底辐射量一万倍。

7·The recent researches of cosmic X-ray background radiation are introduced in this paper.

本文介绍了宇宙X射线背景的研究近况。

8·But natural background radiation is more than 100, 000 times the highest levels detected.

但其检测量大大高于自然本底辐射量一万倍。

9·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。

10·The study on the target radiation characteristic is base on the study on background radiation characteristic.

背景辐射特性研究是目标辐射特性研究的基础。