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"Each year we invest from 3.5 billion to 8.5 billion (yuan), with the amount depending on whether we need to expand our production capacity," Chen said.

"Even if they don't learn any ball playing skills, we hope they feel that sports is a way of releasing pressure and unhappiness. When they meet stress in later life, they can turn to sports," she said.

"Even when they go to mainstream countries, they will discover new routes," she said.

"Every single week practically you hear about scientists being dismissed or relocated and key positions not being filled," Ray Weymann, an astrophysicist and a co-organizer of the open letter, was quoted by The Guardian as saying.

"Everyone has shining business ideas, but it remains a challenge to match genius ideas with end-users' practical needs. It's a cherished procedure for you to design and revise again and again in accordance with end-users' requirements."