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China.org.cn, July 15, 2011
| Advection fog covers buildings as the sun sets in Yantai city, East China's Shandong province, July 13, 2011. Advection fog is produced when moist air is blown over a cool surface and condensation in the form of fog occurs. It is most commonly seen over seas or other bodies of water and It is also common when a warm front passes over an area with significant snow. [Photo/CFP] |
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