between ourselves (或 you and me)

in confidence

咱們（或你我）私下說(shuō)說(shuō)

just between you and me, I don't think it was going to happen.

只是咱們私下說(shuō)說(shuō)，我認(rèn)為這事不會(huì)發(fā)生的。

(in) between times (或 whiles)

in the intervals between other actions

在間歇期間

between you and me

In the strictest confidence.

你知我知，天知地知：表示非常信任

in between

In an intermediate situation

在中間的狀況

My roommates disagreed and I was caught in between.

我的室友不同意，我被夾在中間進(jìn)退兩難

in between times

During an intervening period; in the meantime

穿插著；同時(shí)：在其間的一段時(shí)期；同時(shí)

has written several books and teaches in between times.

在寫(xiě)書(shū)的同時(shí)也教書(shū)