《横山号》是由周伟执导，杜雨露,吴健主演的剧情片。该电影于2012年在大陆上映。石国梁为解决边远地区群众看病难的问题，身先士卒，坚定地投身于“流动医院”的事业当中。斯日大学毕业后，热切地回到生养她的内蒙古大草原，希望成为牧民的贴心医生和健康使者。然而，在医疗实践中，她发现自己无法面对病人。在母亲萨日娜的鼓励下，徘徊在人生的十字路口的她选择加入“流动医院”，追随石国梁救死扶伤。医疗车行走在茫茫的内蒙大草原上，一路艰辛坎坷，但终没能阻挡他们积极救助当地牧民的步伐，斯日也在一次次救助中真正成长起来。一场突如其来的鼠疫让石国梁的儿子石蒙生看清自己内心深处对父亲、对女友斯日的爱，他毅然放弃出国的机会，加入了流动医院，成为大草原上又一名白衣天使。
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