essentialsn.要件；概要essentialadj.本质的；必要的；重要的n.要素；必需品essential convergence本质收敛essential ingredients成立要件essential proteinuria自发性蛋白尿, 特发性蛋白尿(症), 原发性蛋白尿(症)Essential Air Service主要空中勤务essential psychopathy原发性精神病态essential of movement动作本质特点essential aggregation互利群聚essential anisophoria特发性隐斜参差Essential hypertensin原发性高血压essential epimorphism本质满射