blunder upon
无意中发现
A:Is this watch yours?
A:这是你的手表吗?
B:No, it isn't mine. I blundered upop it under the sofa. Do you know whose watch it is?
B:不是我的,我在沙发下面拣到的。你知道是谁的吗?
C:Let me have a look. It's mine. I have been looking for it, but just can't find it. It's a present from my father.
C:让我看一看,这是我的手表,我一直在找它,就是找不到。这是我父亲送我的礼物。
B:Well, here you are. Remember to put it in a proper place.
B:噢,给你吧,记得把它放好。