同义词整理答:hinder, impede, obstruct, hamper, held back, get in the way of, coop, abstinence,refrain, avert 必要的 imperative, entail, liable, mandatory 主要的 paramount ,cardinal 衰弱 wane, enervate, infirmity 易变的 volatile,fickle 悲伤 distress, grieve, sorrow, grief 贫穷 ...
prevent的用法及词组答:【同义词】preclude vt.阻止, 排除 stop v.停止, 阻止, 停留...thwart v.反对, 阻碍 ; n... inhibit v.抑制, 阻止, 使不能 block n.街区, 木块, 石块... avert vt.转开, 避免, 防止 avoid vt.避免, 逃避, [... foil n.钝头剑, 箔, 陪衬...check v.检查, 阻止, 核对......