In this use, SF is a short written form of science fiction: stories about imagined science, space, other worlds, future machines, and what people might do with them. Bookshops, fan clubs, and review pages use SF a lot; it is a label on a shelf, not a word you must say out loud.

In this use在這個用法裡，SF SF is a short written form of science fiction是science fiction的書面縮寫：stories about imagined science, space, other worlds, future machines, and what people might do with them指想像的科學、太空、其他世界、未來機器，以及人們可能怎麼用它們的故事。Bookshops, fan clubs, and review pages書店、書迷社團和書評版面 use SF a lot很常用SF這個縮寫；it它 is a label on a shelf是書架上的標籤，not a word you must say out loud不是一定要唸出來的字

When people speak, they more often say science fiction or sci-fi. Sci-fi can sound a bit pop and loose; SF can sound a bit more “this is the genre, seriously,” though plenty of readers use both for the same books.

When people speak人們講話的時候，they他們 more often say science fiction or sci-fi比較常說science fiction或sci-fi。Sci-fi Sci-fi can sound a bit pop and loose聽起來比較通俗、隨性；SF SF can sound a bit more "this is the genre, seriously,"聽起來比較像「這是正經的類型」，though plenty of readers use both for the same books不過很多讀者兩個都拿來指同樣的書

SF is not a spoken sentence on its own — you still need a noun: an SF novel, SF films. Other meanings of the letters SF exist in other worlds (a city, a file type), but here the filing is the story genre.

SF SF is not a spoken sentence on its own不能單獨當一句話講——you你 still need a noun還是需要一個名詞：an SF novel, SF films。Other meanings of the letters SF SF這幾個字母的其他意思 exist in other worlds存在於別的領域（a city, a file type一個城市名、一種檔案格式），but here在這裡 the filing is the story genre歸類是指這個故事類型