CPC's ruling legitimization faces many challenges during the transformation period. 轉型時期執政黨的執政合法性面臨諸多挑戰。
The time scale of variations with the second period is still uncertain due to the limitation of data time length. 由於數據時間長度的限制,氣候轉型的時間尺度還不明確,也不清楚其是否有明顯的周期性。