(每日一词）nostalgia

nostalgia  /nɒˈstældʒə/ n. (尤指对幸福时光的) 怀旧; 思乡

meaning: Nostalgia is an affectionate feeling you have for the past, especially for a particularly happy time.

词源：nost- 表示nest 窝

词根：alg- 疼（联想一个女生手被划伤了说，啊老公，疼）

后缀：-ia 名词后缀，疾病

e.g. The song brought back a rush of nostalgia for my high school days.  这首歌勾起了我对高中时光的怀念之情。