"where in the world" in Chinese (Simplified)
到底在哪里？世界上哪里？
Definition
用于表达你对某人或某物的位置完全不知道，表明惊讶或烦恼。
Usage Notes (Chinese (Simplified))
属于口语表达，用来加强疑问句，多带有感叹或焦虑的语气，类似“到底在哪里”。不适合正式场合。
Examples
Where in the world is my phone?
我的手机**到底在哪里**？
Where in the world did you find this rare book?
你**到底在哪里**找到的这本稀有的书？
Where in the world are we supposed to go now?
我们**到底应该去哪**？
Where in the world have you been? I was starting to get worried!
你**到底去哪了**？我都开始担心了！
I've looked everywhere! Where in the world did you put the keys?
我到处找了！你把钥匙**到底放哪了**？
Where in the world do you think you're going dressed like that?
你觉得你**到底要去哪**，穿成那样？