preying

This problem has been preying on my mind all day.

这个问题让我伤了整整一天脑筋。

This matter has been preying on my mind all day.

这个问题整天萦绕在我的头。

The death of his father is really preying on his mind at the moment. He thinks it was his fault.

眼下，父亲的死成为他的一块病，他认为那是己的过错。