requisite       
 adjective [ before noun ]  formal uk/ˈrek.wɪ.zɪt/ us/ˈrek.wə.zɪt/
 必要的;需要的;必不可少的
necessary or needed for a particular purpose
  He lacked the requisite skills for the job. 他缺少从事这项工作所必需的技能。 
 The requisite number of countries have now ratified the convention. 批准这项条约的国家已经达到了规定的数目。 
 Synonyms: necessaryneededneedful 
 requisite       
noun [ C usually plural ]  formal uk/ˈrek.wɪ.zɪt/ us/ˈrek.wə.zɪt/
 必需品;必要条件
an important necessary thing
  A good book is a requisite for long journeys. 一本好书是长途旅行必备之物。 
 Self-esteem, self-judgment and self-will are said to be the three requisites of independence. 自尊、自量和坚持自我据说是自立的3个必备条件。 
 Synonyms: essential necessityrequirement