"where on earth" in Chinese (Simplified)
到底在哪里究竟在哪里
Definition
用于表达强烈的惊讶或困惑，询问某事物或某人到底在哪里，相当于“究竟在哪里？”
Usage Notes (Chinese (Simplified))
属于非正式、强调语气的表达，多用于口语，对问题表示惊讶或困惑。比带脏话的说法委婉。常用于朋友、家人之间，不适合正式场合。
Examples
Where on earth are my keys?
我的钥匙**到底在哪里**？
Where on earth did you go after school?
你放学后**到底去了哪里**？
Where on earth is everyone?
大家**到底在哪里**？
I've looked everywhere—where on earth could it be?
我到处找了——**到底在哪里**？
Where on earth have you been? I was starting to worry.
你**到底去哪儿了**？我都开始担心了。
Where on earth did you find that vintage jacket?
你**到底在哪里**找到那件复古夹克的？