The airline banned the passenger after his unprovoked attack on a flight attendant.

那名乘客無故攻擊空服員後，航空公司禁止他再搭乘。

Our customer service team should never tolerate unprovoked verbal abuse from callers.

我們的客服團隊絕不應容忍來電者無緣無故的言語辱罵。

The manager apologized for his unprovoked outburst during Monday's budget meeting.

經理為他在週一預算會議上無故發飆一事道歉。