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Atomic clocks are the most accurate time and frequency standards. They use vibrations of atoms to measure time. An accurate and ultra-stable set of atomic clocks is essential for global navigation satellite systems.

BUENOS AIRES, Nov. 19 (Xinhua) -- Representatives from more than 100 media outlets from China and Latin America and the Caribbean on Monday agreed to boost cooperation.

BEIJING, Nov. 25 (Xinhua) -- A Chinese mainland spokesperson on Sunday said the mainland will continue to enhance solidarity with Taiwan compatriots and follow a path of peaceful development of cross-Strait relations.

MADRID, Nov. 28 (Xinhua) -- China and Spain agreed on Wednesday to build on the 45th anniversary of the establishment of diplomatic ties to jointly promote the development of the relationship and deliver more benefit to the two peoples.

Military authorities conducted extensive research, with over 60,000 soldiers and officers surveyed before the reform plan was unveiled, the spokesperson said.