For example, the Portuguese word "saudade," which means something like a bittersweet nostalgia for a person or thing that has passed, is a word that doesn't exist in English.

例如：葡萄牙语的“saudade”一词，是一个英语中没有的词，其含义是：对某个人或某件已经过去的事情的苦乐参半的怀旧之情。

youdao

Nostalgia comes from the Greek word for homecoming (nostos) and pain (algos).

“怀旧”来自希腊单词“回家”（nostos）和“痛苦”（algos）。

youdao

There is a certain kind of melancholy affiliated with the word "nostalgia" - a sense of romanticism evoked by reminiscence, the will to hold onto the past.

“怀旧”这个词带有一种忧郁的意义，它是一种由回忆引发的浪漫精神，以及对过去的执着。

youdao

Pondering the changes, he uses the word natsukashii (nostalgia), as the smoke from his cigarette wafts into nothingness.

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But I think this market has the potential to boom a decade or two from now as nostalgia sets in for the printed word.

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Nostalgia is turning out to be a powerful business model on Kickstarter, although nostalgia might not be the right word for original IP built largely in a modern game development engine.

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