(一).Mum's the word. 这是秘密。/别对任何人说。

原音重现：
A:These documents are confidential.Understand?
这些是机密文件，明白吗？
B:Yes,I do.Mum's the word.
明白，我不会对任何人透露半个字的。
英英释义：
This is usually said when something shouldn't be discussed.It's a way of saying "Keep it a secret."

(二).Just between us/you and me. 这是我们之间的秘密。

原音重现：
A:Just between us,my marriage isn't going so well.
这是我们之间的秘密，我的婚姻并不如意。
B:Are you fighting a lot with your husband?
你经常和你丈夫吵架吗？
英英释义：
This means "Only you and I know." It is a way to say some information is very private.
美剧表达：
1.This is between you and me.
只有我和你知道此事。
2.Alright,I got an idea.But it stays between us.Agreed?
好了，我有主意了。但这是我们之间的秘密，行吗？
3.What is said here,stays here.
在这里说的话不能告诉任何人。

(三).Don't tell a soul. 别传出去。/把它带到坟墓里去。

原音重现：
A:These letters are from the Yakuza.Don't tell a soul.
这些是那个流氓的信，别声张。
B:Alright.What do you they say inside?
好的，里面写了些什么？
英英释义：
This warns someone not to tell anyone else.It is like saying "Don't discuss this with anyone."
美剧表达：
1.You're not going to tell a soul.
别对任何人说。
2.Don't tell a soul,not even your mom.
别告诉任何人，包括你妈妈在内。