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Chen Jia contributed to this story.

Chen said she knew the police were searching for her when she heard them knocking on the door, so she hid herself in the compartment.

Chen Xinxin, a researcher at the Chinese Academy of Social Sciences, also gave a presentation of the current situation in Hong Kong.

Chen hoped that China and Britain should work together to contribute to the green development of the B&R Initiative, the Sino-British friendship and the Community of shared future for mankind.

Cheng Yuanziye, a volunteer and China Radio International broadcaster, said the technical terms and processes were difficult to understand at first.