(Unit1TextB课文段落)10. Other students sometimes picked on the troubled boy. For the past few months, Weise had been tutored at home. He was depressed and being treated for suicidal tendencies. Doctors had prescribed Prozac to try to get him into a better balance. But today Weise carried a 12-gauge shotgun, and two semiautomatic pistols. On his face was a frightening smile. 题目 : What does the phrase “ pick on ” mean?