astound：to make someone very surprised or shocked [= astonish]:

例：We were astounded to read your letter.

我们看了你的信大吃一惊。

shock：to make someone feel very surprised and upset, and unable to believe what has happened: （惊奇的难以置信）

例：The hatred in her voice shocked him.

她声音中的怨恨让他吃惊得难以置信。