相关单词近义词 essential 本质的, necessary 必要的, necessity 需要, requirement 必要条件, indispensable 不可缺少的, required 必需的, mandatory 法定的, obligatory 强制性的, vital 至关重要的, basic 基本的, qualification 资格, prerequisite 先决条件, need 需要, needful 必需的, needed 需要的临近词requisition, requirements net, requisites, requisite for, requisite value, requisite skill, requisite space, requisite oxygen, requisite amount, requisite measure, requisite voucher, requisite variety 返回 requisitely