高手帮忙解释一段英语句子------------务必高手帮忙

高手帮忙解释一段英语句子------------务必高手帮忙
Doctor are known to be terrible pilots.They don’t listen because they already know it all.I was lucky：I became a pilot in 1970,【almost ten years before I graduated from medical school.】 I didn’t realize then,but becoming a pilot makes me a better surgeon.I loved flying.As I flew bigger,faster planes,and in worse weather.I learned about crew resource management（机组资源管理）,or CRM,a new idea to make flying safer.It means that crew members should listen and speak up for a good result,regardless of positions.
为什么医生是最糟糕的飞行员?医生就是医生,怎么还当了飞行员了?
如何翻译?我记得老师说过：时间段+before ,意为：多长时间以后.也就是说ten years before,翻译为十年后,我就从医学学校毕业.但是,许多人说十年前,我从医学学校毕业.有点郁闷.