desideratum

noun

1. 想望的东西；需要的东西
   a thing that is wanted or needed

1. Her only desideratum was health.
   她唯一的希望就是身体健康。
2. The second desideratum, of low thermal and high electrical conductivity, was achieved by dividing the bismuth telluride into pellets a few nanometres across.
   第二个所愿望之物&低热量和高导电性，是通过将整个铋碲划分成几个纳米颗粒实现的。
3. The point is not that the artist has 'penetrated the character' of his sitter, that commonplace desideratum of portraiture ( Robert Hughes)
   关键并不是画家洞察了他的模特儿的性格特征以表现肖像画通常表达的意义（罗伯特·休斯）

noun

1. something desired as a necessity
   1. the desiderata for a vacation are time and money