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The diplomatic ties are based on the principle of "sincere friendship, equality, mutual confidence, mutual support and common development," Liu said.

Another motive is to cement its alliance with the United States, which, as the world's top power, imposes itself over the South China Sea issue in an unmistakable endeavor to contain China.

The food safety situation is generally good, but problems in some sectors and places are prominent, Wang said.

China and U.S. officials have repeatedly signaled willingness to finalize a deal before Obama leaves the White House in January 2017.

Bunse expected Chinese and German companies to cooperate on projects as suppliers of special-purpose machinery, building materials or professional and management services.