回答

・secret between you and me
・secret between just two people

「我們兩個人之間的秘密」的英語叫做 secret between you and me 或是 secret between just two people 來表達。

Never tell anyone else, it's a secret between you and me.
（絕對不能告訴任何人，這是我們兩個人之間的秘密。）

I told you because I have confidence in you. It's a secret between just two people.
（我告訴你是因為我信賴你，這是我們兩個人之間的秘密。）

有幫助｜0