| 1 | Exposure to more artificial light from TVs or computers is one theory. | |
| 2 | The government is continuing its crackdown on lawyers, human rights defenders and activists who dedicate themselves to rule of law and the exposure of rights abuses. | |
| 3 | Sunlight is the best source of vitamin D, but exposure to sunlight can also raise the risk of skin cancer. | |
| 4 | Julia, from California in USA, suffered from metabolic disorder, which caused her leg could not expose in the sun. | |
| 5 | The body gets most of its vitamin D not from diet but from skin exposed to the ultraviolet B radiation in sunlight. |