Dr Lee believes that men who exercise can halve their risk of cancer of the colon.李医生相信锻炼身体能使患结肠癌的风险降低一半。Dr Lee was cleared of serious professional misconduct.李医生严重失职的罪名被洗清了。It was malaria, but Dr Lee hadn't recognized the symptoms.患的是疟疾，但李医生没有辨认出症状。