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"China has multiple landforms including plateaus, mountainous regions and plains, so the helicopter must be able to operate in every landform. Foreign helicopters have not met our needs, especially those in plateaus and mountains," he said.

"By then Xi'an will represent the national image, a critical juncture of the Belt and Road Initiative and a competitive and influential international metropolis," he said.

"But the lack of adequate regulation has led to many scams and questionable fundraising practices in the field of cryptocurrencies," said Chan.

"Chen's behavior is a breach of administrative discipline and the norms of being a teacher," said Ruan Chuansheng, a law professor at the Party School of Shanghai CPC Committee.

"Challenging an established player with strong infrastructure, excellent customer services and deep pockets is never easy," he said.