The travel ban that Washington imposed on 26 European nations has been effective since Friday midnight.
The trilogy has sold more than 7 million copies in Chinese and has been translated into more than 10 languages including English, Spanish and German, according to China Educational Publications Import and Export Corporation Ltd.
The two corridors connect Vietnam's capital of Hanoi with Kunming, capital of Yunnan, and with Nanning, capital of Guangxi.
The trend has driven up demand for short-term rental apartments, said Li Zhenni, chief brand officer of Chinese homestay booking platform Tujia.
The two countries have not yet been in touch regarding a possible timetable for a resumption of negotiations, Gao said.
The two countries decided to build a comprehensive strategic partnership based on mutual respects and common development, which will inject great power to the bilateral cooperation, Xi said.
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The two companies said they also plan to create another joint venture to promote and develop new markets and applications for defense products and services.
The two countries share a common appreciation for free trade and both aspire to be technologically developed countries, the president said.
The transformation from low-price manufacturer to premium brand is not easy. In addition to increased costs for labor and raw materials, such as rubber and petroleum products, the end of last year saw the exported goods price index for footwear products fall by 10 percent from 2015.
The two labs, one located in Belgrade, the Serbian capital, and the other in the southern city of Nis, will be capable of testing a combined 3,000 samples per day once they begin to operate, significantly boosting the country's testing capabilities.