essentialia[法] 要素essentialadj.本质的；必要的；重要的n.要素；必需品essential iris atrophy特发性虹膜萎缩症essential dysmenorrhea[医] 自发性痛经essential heterophoria特发性隐斜视essential hvpertension原发性高血压essentials of marriage[法] 婚姻的要件essential hypertention原发性高血压病essential amino-acids必需氨基酸Essential hypernatremia原发性高钠血症essential dysmenorrheal原发性痛经essential trace element必需微量元素