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Meanwhile, Party committees and governments at all levels should create suitable conditions so that teachers are "content and enthusiastic," Xi said.

Prior to the inauguration of the main bridge's construction works, she unveiled the plaque of the river training works, the second most costly component of the 3-billion-U.S. dollar project conducted by one of the largest international companies, Sinohydro Corporation Limited.

Quantum communication boasts ultra-high security as a quantum photon can neither be separated nor duplicated. It is hence impossible to wiretap, intercept or crack the information transmitted through it.

The attendees from more than 10 countries and regions including China, France, Germany, Japan and Iran will discuss archaeological findings, studies of Dunhuang documents, grotto art, and the role of Dunhuang in the history of Silk Road.

China and Saudi Arabia are both important G20 members and emerging economies. They should work together to ensure G20 functions well as the major forum for international economic cooperation, Xi said.