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"Due to the large user base, there may be a significant surge in applications. Please have patience and wait it out, we promise to handle it appropriately," Ofo said in a recent statement posted on its official Sina Weibo account.

"Facing pressure from uncertainties related to global trade, a growing number of Chinese companies have attached importance to the development of high-tech products to tap the overseas market," said Xu Bing, spokesman of the China Import and Export Fair.

"Ever since I grew up, devices have always had screens and they don't have physical buttons," he said.

"Everybody gets nervous when they go on the narrow path," he said.

"Emerging industries like high-tech enjoy an increasingly important role in driving Beijing's economic growth in the first half of the year," said Pang Jiangqian, deputy head of Beijing Municipal Bureau of Statistics, at a news conference on Wednesday.