He's British through and through.

他是地地道道的英国人。

I love you through and through.

我彻头彻尾地爱你。

They are dogs through and through.

它们是彻头彻尾的狗。

He is a liar through and through.

他是个彻头彻尾的骗子。

She is a liar through and through.

她是一个彻头彻尾的说谎者。