1、可以用unique這個單詞或者是the only one。
2、但是還有一種更加地道更加有味道的表達：one of a kind;If you refer to someone or something as one of a kind, you mean that there is nobody or nothing else like them.如果你用這個表達來形容某人或者某物，你的意思就是在說他們是獨一無二的，特别的。
3、例句：
This is a one of a kind opportunity—you have to take it!
這是一次非常罕見的機會，你一定要抓住！
I dont know how well ever replace May after she leaves. Shes really one of a kind.
我們不知道梅離開之後誰能取代她，她是獨一無二的。
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