on his mind的用法和樣例：
例句
- He has nothing but money on his mind.
他思想上除了錢外沒有別的。 - I could see that he had something on his mind, and soon I rapped to what it was.
我看出他有心事，不久就知道那是怎麼一回事了。 - The spectre of unemployment was always on his mind.
他心頭一直縈繞著可能失業的恐懼感。 - The thought that he was responsible for her death preyed on his mind.
他一想到自己對她的死負有責任就感到心如刀割。
