留念 liúniàn
(1) [accept or keep as a souvenir;taken as a memento]∶留做纪念
照相留念
(2) [recall with nostalgia]∶留恋;怀念
留做纪念。
如：「这次毕业旅行，大家在旅馆前合影留念。」
英语 to keep as a souvenir, to recall fondly
德语 Relikt (S), Reliquie (S), etw. zum Andenken schenken
法语 garder en souvenir