fall off one's chair
很吃惊
A:I almost fell off my chair when I was told they had gotten divorced.
A:当有人告诉我他们已经离婚了的时候，我吃惊得不得了。
B:Me too. I thought they were the happiest couple of all the time.
B：我也是，我一直认为他们是最幸福的一对夫妻。
A:I wonder how the change of their life comes.
A：我想知道他们的生活是怎样起变化的。
B:I don't know.
B：我也不知道。