My mom was really upset because he was accusing her of having an affair with another man.

我妈妈真的很难过，因为他指责她和另一个男人有暧昧关系。

《柯林斯英汉双解大词典》

It was apparent from her face that she was really upset.

从面容上一眼就可以看出她确实心绪烦乱。

《牛津词典》

As she was leaving, Emily was really upset to say goodbye.

离开的时候，埃米莉依依不舍地说再见。

youdao

"We are not really upset about it, but what is psychologically disturbing is that people can be annoyed or feel insecure at the slightest differences that appear,"

VOA: standard.2010.02.24

When she was made to--When she gave-- When she was made to look attractive but gave them unfavorable information about themselves, they were really upset about it.

当她打扮得-,当她打扮得很漂亮,却给他们不好的评价时，他们真的很苦恼。

耶鲁公开课 - 心理学导论课程节选

Our first Christmas here, we were really upset that we weren't able to go home and see family during Christmas time.

我们在这儿过的第一个圣诞节真的很失望，在圣诞节期间我们回不了家，也见不到家人。

第一次来纽约 - SpeakingMax英语口语达人

"People were really upset with him and were defacing his jersey a year ago, " he said.

WSJ: Albert Pujols: Who Needs Him?

It used to be 30 years ago, people would come up and be really upset.

NPR: The '80s Strike Back: Devo's Mark Mothersbaugh

"The thing that really upset me was the idea that I was this gold-digger, " she said.

BBC: Profile: Catherine Zeta Jones