There was an astounded expression on his face.

他脸上露出大吃一惊的表情。

I was astounded that he won the first prize.

我很震惊的是他竟然得了第一名。

He seemed rather astounded to the death of the professor.

他似乎对教授的离世感到颇为震惊。

The doctors were astounded (that) he survived.

医生们十分惊愕的是他竟活过来了。

I was astounded by its beauty.

我被它的美丽震撼了。

His arrogance astounded her.

他的傲慢使她震惊。

She looked astounded at the news.

她听到那消息时显得震惊。

She was astounded by his arrogance.

他的傲慢使她震惊。