Northern China is entering its most critical flood-control period, with meteorologists warning that an early rainy season and increasingly volatile weather patterns could heighten the risk of severe flooding in the weeks ahead. 我國北方已進入防汛關鍵期，氣象專家提醒，汛期提前、天氣形勢愈發多變，未來數週發生嚴重洪澇災害的風險將有所上升。 The rainy season in North China officially began on July 10, eight days earlier than the long-term average, according to the National Climate Center. 國家氣候中心數據顯示，華北地區7月10日正式入汛，較常年平均時間提前8天。 "The rainy season this year has arrived both early and with remarkable intensity," said Chen Lijuan, chief forecaster at the center. 國家氣候中心首席預報員陳麗娟表示：“今年汛期不僅來得早，降雨強度也十分突出。” She said an active Northeast China cold vortex — a persistent upper-level weather system that often triggers prolonged rainfall — has contributed to unusually heavy precipitation across northeastern and northern China since...