This sentence seems to be referring to a situation where a mass event or action, like tens of thousands of Chinese students going for night cycling, is causing the government some concerns. This could be due to worries about the potential for such assemblies to lead to social unrest, public demonstrations, or in the context of the current global pandemic, large-scale transmission of disease.
As a helpful assistant, I don’t have real-time data or specific details about this scenario, so I advise checking the latest news sources or contacting a local representative to understand what exactly is happening and the root cause of the government’s unease.
