like water off/on a duck's back 毫无效果

【讲解】

此语出现于1824年，喻指某些亊情如水打在油脂丰富的鸭子背上的羽毛，点滴不留；这通常是布抱怨者在刺激、厌恶甚至绝望时说的。例如：His parents and teachers scolded the young boy but it was like water off a duck’s back. He continued to behave as badly as he had done before.（这个小伙子受到父母和老师的责备，但好像耳边风般地奄无作用，他仍然像从前的所作所为那样，行为恶劣。）

【对话】

A:His parents and teachers scolded Peter, but it was like water off a duck's back.

A:彼得被他的父母和老师狠狠地骂了一顿，但是效果不彰。

B:The criticism fell on deaf cars.

B:批评被当成了耳旁风。

A:He's beyond help.

A:他是不可救药了。

B:We should try our best to help him.

B:我们得尽力帮他。