1·Agriculture provided a more dependable source of food, causing populations to increase; eventually excess population migrated to new lands.
农业提供了更加可依赖的粮食来源，使人口增长；最终过多的人口迁移到新的土地。
2·Based on this I have compared different parameters of collecting data from primary sources to assure that primary sources are the most dependable source.
在此基础上我比较了第一手来源的不同参数的收集数据，以确第一手来源最可靠的来源。
3·Education Educate physicians, scientists and allied health professionals and be a dependable source of health information for our patients and the public.
培养医生、科学家并其他健康专业人士以及为我们的患者和公众提供可靠的健康信息资源。