like water off a duck’s back (警告,建议等)不起作用;毫无影响;被当作耳旁风

【例句】
He always forgets something which his friends said, maybe it's like water off a duck's back.
他总是忘记一些他朋友对他说过的事情，也许他把这些当成了耳边风了吧。

Our criticisms of his talk rolled off him like water off a duck's back.
我们对他的谈话提出批评，而他根本不予理会。