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Citing security reasons, the U.S. Congress passed a law in 2011 to prohibit NASA from hosting Chinese visitors at its facilities and working with researchers affiliated to any Chinese government entity or enterprise.

The two presidents also enjoyed close personal relationship. Recalling their five meetings in the past two years, Xi said he and Zeman have become "good friends, old friends."

"On behalf of the people and government of Ecuador, we thank China for this contribution to our country," said Long.

Xi urged Tsinghua to continue its good work in building students' morals and character, serving the country and producing more talents needed by the nation and the people.

In particular, with its national security law and counter-terrorism law, which were both passed last year, China has made it clear in legal terms that nuclear security is a vital aspect of national security and the battle against terrorism. In addition, the legislation process of an atomic energy law and a nuclear safety law is already under way.