Prosecutors may try to determine if Robb gave false testimony when he appeared before the grand jury.控方可能要努力查明罗布是否在大陪审团面前作了伪证。Robb is torn between becoming a doctor and a career in athletics.罗布在做医生还是当运动员之间痛苦抉择，左右为难。Mr Robb resigned his position last month.罗布先生上个月辞职了。