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"ChinaSF is a leading example for international economic development in the United States," said San Francisco Mayor Mark Farrell, adding the city welcomes business from China.

"China-US economic and trade relations are mutually beneficial in nature," Yang said.

"Chinese companies, led by Huawei and BOE Technology, gained ground. In fact, China was the only country in the top 10 to actually show an increase in US patent activity; all other countries, including the US, saw declines," said Larry Cady, a senior analyst at IFI Claims Patent Services, in an article posted on the technology blog Venture-Beat.

"China will firmly take necessary actions to safeguard its own interests," Foreign Ministry spokesman Geng Shuang said at a news briefing on Wednesday.

"Chinese travelers, especially those born in the 1980s and the 1990s, are becoming increasingly accustomed to homestay in the domestic market. They are the main spenders. So, it would be unreasonable to ask them to use one app for booking rooms in China and another app in overseas markets. We're moving in advance to grow the supply of quality houses in foreign countries," Chen said.