求翻译：Despite the denial, speculation is unlikely to fully die down until Jiang is seen again in public. The last such big occasion was in October 2009 for the 60th anniversary of the founding of the People's Republic. He was also present at an event in Sichuan last year, where his car was reportedly followed by an ambulance. Jiang is said to be suffering from an illness and possibly hospitalised, though it is hard to confirm because China treats the health of its leaders as a state secret.是什么意思？

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