If something is usable, you can actually use it — it works, it is in good enough condition, it is allowed. A phone with a cracked screen may still be usable. Old milk is not. A ticket from last year is no longer usable.

If something is usable如果某個東西是usable的, you can actually use it代表你真的可以用它 — it works它有作用, it is in good enough condition狀況夠好, it is allowed而且是被允許的。A phone with a cracked screen螢幕裂掉的手機 may still be usable可能還是usable的。Old milk is not過期的牛奶就不是。A ticket from last year去年的票 is no longer usable已經不能用了。

There are two shades worth separating. The first is simply "still working, not broken or expired". The second, softer one is "good enough to use, though not great" — when someone says "the room is small but usable", they are praising it very faintly. Hear that hedge; native speakers do.

There are two shades worth separating這裡有兩種語感值得分開來看。The first is simply第一種單純是 "still working, not broken or expired"「還能用、沒壞掉也沒過期」。The second, softer one is第二種比較委婉，是 "good enough to use, though not great"「堪用，但不算好」 — when someone says當有人說 "the room is small but usable"「the room is small but usable」, they are praising it very faintly他們其實是在很勉強地稱讚它。Hear that hedge聽出那個保留的語氣; native speakers do母語人士聽得出來。

In computing and design the word has grown a specific life of its own: a usable website means one that ordinary people can figure out without help, and from this we get usability, a whole field of study.

In computing and design在電腦和設計領域 the word has grown a specific life of its own這個字發展出了自己特定的用法: a usable websiteusable website means指的是 one that ordinary people can figure out without help一個一般人不用別人幫忙就能搞懂怎麼用的網站, and from this we get usability由此衍生出 usabilityusability, a whole field of study這個字，變成一整個研究領域。

Both spellings exist, usable and useable, but usable is far more common now — write that one. The opposite is unusable.

Both spellings exist兩種拼法都存在, usable and useableusable和useable, but usable is far more common now但現在usable常見得多 — write that one就寫usable這個。The opposite is相反詞是 unusableunusable。