which one

基本解釋

Which one of you is Mr. Wang?
你們中間哪一位是王先生?
《新英漢大辤典》
Which one should you use?
您因該使用哪一個呢？
Two schoolgirls were giggling at a letter which one of them had received from a boy.
兩位女生對著信喫喫地笑著，這信是一個男生寫給她們中的一位的。

Many of the matches were fixed. The wrestlers knew before the match which one of them would be the winner.
Right? Never mind the extent to which the language is connected to a world of which one is attempting to make sense.
我們都試圖理解這個世界,語言則與這個世界息息相關(guān),即使略去這一點不談。
普林斯頓公開課 - 人性課程節(jié)選
but everyone knows, like, which one's, ah... which societies exist and who is in them, just things like that.
但是每個人都知道這種社團的存在，也知道社團的成員是誰，這些事情都不是秘密。
耶魯對比哈彿 - SpeakingMax英語口語達人

Iran has now released a video of the 15 detainees in which one of them speaks.
NPR: Iran, Britain at Impasse over Captives