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- Any of a large group of nitrogenous organic compounds that are essential constituents of living cells; consist of long strings of amino acids. 含氮有机化合物大的组合，是生命细胞的基本组成部分，由长的氨基酸链构成。
- Existing as an essential constituent or characteristic; intrinsic. 固有的作为一种基本成份或典型特征而存在的; 内在的
- Existing as an essential constituent or characteristic;intrinsic. 固有的作为一种基本成份或典型特征而存在的；内在的
- A purine base,C5H5ON5,that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分。
- A pyrimidine base, C5H6N2O2, that is an essential constituent of DNA. 胸腺碱一种属于脱氧核糖核酸重要成分的嘧啶碱
- A purine base, C5H5ON5, that is an essential constituent of both RNA and DNA. 鸟嘌呤一种嘌呤碱，分子式为C5H5ON5，为核糖核酸和脱氧核糖核酸的主要组成部分
- A pyrimidine base, C4H5N3O, that is an essential constituent of RNA and DNA. 胞核嘧啶一种嘧啶碱基，C4H5N3O，是核糖核酸和脱氧核糖核酸的基本成分
- Do you know the constituents of the mixture? 你知道这种混合物的成分吗？
- Her most essential quality is kindness. 她最主要的品质是善良。
- A concentrated preparation of the essential constituents of a food, a flavoring, or another substance; a concentrate 浓缩物,汁:一种食物、调味品或其它物质的精华部分的浓缩制剂;浓缩物
- Surprise is an essential component of my plan. 我这项计划主要就是想使大家惊喜一下。
- Rice is our essential foodstuff in life. 大米是我们生活的基本食物。
- National unity is essential in time of war. 举国团结在战时是非常重要的。
- What is the essential theme of the play? 这剧本的主题是什麽?
- Limit your expenditure to what is essential. 你要把开销限制在必要的范围内。
- It is essential that he get up early. 他有必要早起。
- Chemical Constituents in Essential Oil from Magnolia Denudate Desr. 白玉兰精油的化学成分。
- Get a hustle on to stockpile these essential material. 赶快把这些重要材料贮放起来。
- Mass education is essential in promoting democracy. 民众教育对提倡民主是非常重要的。
- It is essential to balance one's budget. 量入为出是很重要的。
