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"Common interests are catalysts of friendship," Lei said. After becoming acquainted with people in her classes, she starts to meet them regularly after class and friendships bloom.

"China's civil aviation industry has made a great contribution to the country's economic growth," said Zhang Qihuai, a senior lawyer who specializes in civil aviation, adding that more development can be expected in terms of safety, infrastructure, public transport and general aviation.

"Compared with major crops such as rice, wheat and corn, soybean has much lower yields and requires more land, which is a major reason why it has not been promoted as extensively in China because of limited arable land," Han said.

"Currently, COVID-19 is eroding human life and health. The world has fallen into a deep recession. Global governance is facing serious dilemmas with huge tides of unemployment, bankruptcies and supply chain disruptions as well as the ever growing deficits in governance, development and trust," Wang said.

"Chinese consumers have become increasingly willing to pay for better services in the past one to two years," said Chen Zhiyu, senior vicepresident of Sam's Club China. He predicted that the membership model would enter a phase of explosive growth in the years to come.