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Liu called for innovation by scientists in different disciplines, with a focus on core technologies.

U.S. Secretary of State John Kerry also said the United States and China should make joint efforts to push the Paris agreement to become effective as early as possible.

U.S. Secretary of State John Kerry said U.S.-China low-carbon cooperation will contribute to the sustainable growth of the two economies and the global fight against climate change.

The Chinese president said both sides should seek to dovetail their development strategies and enhance overall planning and coordination on cooperation projects.

Currently, the port cannot host several gigantic cruise ships for long, he explained. Therefore, tourists rush to Athens to visit the Acropolis hill and leave within hours. The port's extension is a priority so that cruise ships can remain docked for longer at Piraeus and foreign visitors can travel by train to other archaeological sites in the mainland, Potamianos said.