| 1. | Naturally - occurring radiation exists everywhere in nature
宁静优美的大自然其实存有各种天然辐射 |
| 2. | Another source of natural radiation is cosmic rays from space
另一个天然辐射来源是来自外太空的宇宙射线。 |
| 3. | Another source of natural radiation is cosmic rays from space
另一个天然辐射来源是来自外太空的宇宙射线。 |
| 4. | Radon radon - 222 is a major source of natural radiation . it is the decay product of
氡气特别是氡- 222是一个主要的天然辐射源。 |
| 5. | The natural radiation is the main source of all radiation exposure to the public
在人类所受到的辐射照射中，天然辐射是主要的。 |
| 6. | Radon ( radon - 222 ) is a major source of natural radiation . it is the decay product of
氡气(特别是氡- 222 )是一个主要的天然辐射源。 |
| 7. | As a result , our exposure to artificial radiation is much lower than that to natural radiation
所以人们吸收的人工辐射，远比天然辐射小。 |
| 8. | As a result , our exposure to artificial radiation is much lower than that to natural radiation
所以人们吸收的人工辐射，远比天然辐射小。 |
| 9. | We are therefore constantly exposed to different kinds of radiations , especially natural radiation
其实我们每日都会接触到各种各样的辐射，特别是天然辐射。 |
