她真聪明用英语怎么说

"She is really smart." 表示她非常聪明。

来源：这是一句常用的英语表达方式。

例句：

"She is really smart. She graduated from Harvard with honors." (她真聪明，她以优异成绩毕业于哈佛大学。)
"He said she was really smart, but I didn't believe him until I met her." (他说她非常聪明，但我直到见到她才相信他。)