“怀旧”一词,《辞海》解释为:追念古昔、怀念旧友。杜甫《秦赠萧二十使君》诗曰:“结欢随过隙,怀旧益沾巾”。怀旧是一种常见的心理现象,例如思念故乡、故人,“举头望明月,低头思故乡”、“月是故乡明”。对故土的思念能激发人的爱国情,南宋爱国诗人陆游八十岁时仍盼望回到故土,因而写下了“王师北定中原日,家祭无忘告乃翁”的著名诗句。 “Nostalgia”, “Cihai” is interpreted as: the memory of the past, miss the old friends. Du Fu “Qin donated Xiao XX Shi Jun,” Poetry said: “Huan go with the gap, nostalgia benefit towel.” Nostalgia is a common psychological phenomenon, such as missing hometown, so people, “look up the moon, bow their heads home”, “Moon is hometown.” The miss of his homeland can arouse people’s patriotic feelings. When Lu You, a patriotic poet of the Southern Song Dynasty, still looked forward to returning to his homeland when he was 80, he wrote the famous verse of “Wang Shih-bei set the Central Plains Day, offering no sacrifices to his family sacrifices.”