I know the reason whereat you are displeased.
我知道你為什么不快.
《現代英漢綜合大詞典》
I know the things whereat you are displeased.
我知道你所不高興的是什么.
辭典例句
He turned to leave, whereat she began to weep.
他轉身離開, 當下她開始哭了起來.
互聯網
Whereat was he offended?
他為何生氣?
互聯網
"this is a statement whereat the listeners may get angry"
"we were at a party whereat there was lots of dancing"