GRE词汇资料：imperative

　　imperative: adj. 迫切的： needing immediate attention

　　【考法1】n. 命令： a statement of what to do that must be obeyed by those concerned

　　【例】 a secretary of defense who was fond of issuing harshly worded imperatives 一个很喜欢发布措辞严厉的命令的国防部长

　　【近】 command, decree, dictate, direction, directive, instruction, order, word

　　【考法2】adj. 命令的，强制性的：forcing ones compliance or participation by or as if by law

　　【例】 requests that grew more and more imperative 命令性越来越强的请求 

　　【近】 compulsory, forced, involuntary, obligatory, peremptory, required

　　【反】 optional 可选择的;voluntary 志愿性的

　　【考法3】adj. 迫切的： needing immediate attention

　　【例】 an imperative need for medical supplies in the earthquake-ravaged country 地震灾区国家对于医疗物资的迫切需求

　　【近】 clamant, compelling, critical, crying, emergent, exigent, imperious, importunate, pressing, urgent

　　【反】 noncritical, unimportant 不重要的

　　【考法4】adj. 必要的： impossible to do without

　　【例】 Proper equipment is imperative for the success of this chemical experiment. 合适的仪器是这个化学实验成功必不可少的条件

　　【近】 indispensable, necessary, necessitous, requisite, vital

　　【反】 dispensable, inessential, needless, unnecessary 非必须的