preying

this is a mean type of theft by ruthless people preying on the elderly.

是无情之徒利用老人一种卑鄙偷窃。

This matter has been preying on my mind all day.

个问题整天萦绕在我心头。

This problem has been preying on my mind all day.

个问题让我伤了整整一天脑筋。

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

眼下，父亲死一块心病，认那是自己过错。