I hadn't seen her for 20 years, but I recognised her immediately.

recognised 是动词 recognise 的过去式，recognise 的意思是"认出、识别"。recognise 由前缀 re-（表示"再次"）和词根 cognise（来自拉丁语 cognoscere，意为"知道、认识"）组成，字面意思是"再次认识"。 在美式英语中拼写为 recognized，英式英语拼写为 recognised。