be upset at 与 be upset about 有什么区别?
问题描述：
be upset at 与 be upset about 有什么区别?
RT
如果有例句就最好了，谢谢····
答
be upset at sb 对某人感到心烦,不安
be upset about sth 对某事感到心烦,不安
eg.He was upset at his uncle about laughing all the time