someone's heart sinks
非常失望
A:Do you feel better?
A:你觉得好点了吗?
B:Much better. My heart sank when Mary told me that she wanted to leave me.
B:好多了,当玛丽告诉我她要离开时,我的心为之一沉。
A:Don't be sad. Everything will be fine.
A:别伤心,一切都会好起来的。
B:Thanks a lot. You're so kind.
B:多谢了,你真好。