Everything I tell them just goes in one ear and out the other.

我无论对他们说什么都只被当作耳边风。

I'm very angry with my little brother because he always let my words go in one ear and out the other.

我对我弟弟非常生气，因为他对我的话总是左耳进右耳出。

In one ear and out the other.

左耳进，右耳出。

My words just go in one ear and out the other.

你对我的话老是一个耳朵进一个耳朵出。

That rubbish goes in one ear and out the other.

那种废话都是左耳进，右耳出。