essentialityn.本性；真髓；本质essentialadj.本质的；必要的；重要的n.要素；必需品Essential Repair Parts Stockage List主要修理零件存储表Essential oil in Atractylodes lancea苍术挥发油essential elements of agrometeorology农业气象要素essential progressive atrophy of iris原发性进行性虹膜萎缩Essentials of Organizational Behavior组织行为学essential oil-containing mouthrinse香精油漱口水Essential hemorrhagic thrombocythemia自发性出血性血小板增多症essential analog electronic technology模拟电子技术基础Essential reproductive health services基本生育健康服务essential intellectual property rights基本知识产权