根据16年财报,事情是这样的:In April 2016, Mr. Yunsheng Zheng tendered his resignation from co-chief financial officer position for personal reasons, effective in June 2016. In December 2016, at our request, Mr. Zheng rejoined us as our chief financial officer to help us through the transition period until we recruit a new chief financial officer. 就是16年4月,高辞任了联席CFO, 郑独任,16年6月,郑辞任。16年12月,郑复任。18年4月,郑再次辞任。