所願望之物,迫切需要之物
Desideratum \De*sid`e*ra"tum\, n.; pl. {Desiderata}. [L., fr. desideratus, p. p. See {Desiderate}.] Anything desired; that of which the lack is felt; a want generally felt and acknowledge.
desideratum n : something desired as a necessity; "the desiderata for a vacation are time and money" [also: {desiderata} (pl)]