Chinese President Hu Jintao (2nd L, front), Turkmen President Gurbanguly Berdymukhamedov (3rd L, front), Kazakh President Nursultan Nazarbayev (1st L, front) and Uzbek President Islam Karimov (R, front) attend the inauguration ceremony of the China-Central Asia natural gas pipeline in the gas plant on the right bank of the Amu Darya River, Turkmenistan, on Dec. 14, 2009.[Xinhua]