The phrase "What's on your mind?" is commonly used to ask someone what they are thinking about or what is bothering them. It is a casual and informal way to start a conversation or to find out more about someone's thoughts.
Examples:
"What's on your mind today?"
"Is there something on your mind that you'd pke to talk about?"
中文翻译:
"今天在你脑海里想的是什么?"
"有什么在你脑海里的事想和我说说吗?"