1.obsolete和obsolescent obsolete(no longer in use or already out of date)“已废弃的，已不用的”. an obsolete vessel废舰；an obsolete word已废的词。 obsolescent (going out of use or becoming out of date)“逐渐被废弃的，快要不用的”；Do you think that faxes are obsolescent? 2. officious和official officious“爱管闲事的”，“非正式的”；an officious statement非正式声明。official“官方的”，“公务上的”. an official gazette官方通报；an official letter公函,公文；an official record正式记录 3.peaceable和peaceful，peaceable (peaceloving, mild, placid, not inclined to quarrel or fight or existing in peace)“平和的”；“温和的”；“温顺的”。peaceful“和平的，太平的”；“宁静的”；“爱好和平的”；a peaceful night s sleep . peaceful coexistence和平共处；peaceful uses of atomic energy原子能的和平应用。 historic与historical historic: famous in history, 历史上著名的 historical: belong to history 历史上的 electric与electrical electrical: worked by, changed with， 用电的，带电的, 有电的 ～ current cable electrical: ～ engineering apparatus economic与economical economic: of economics ～ policy geography crisis crops economical: careful in the spending of money 经济的，节俭的 an ～ housewife store industrial与industrious industrial: of industries 工业的 the ～ revolution products system industrious: hard-working 努力的 ～ people considerable与considerate considerable: great much 相当多（大）的 a ～ income distance considerate: thoughtful 体谅的， She is ～ to others. sensible与sensitive sensible: reasonable, 实用的， 明知的 a ～ woman idea 豁达的妇女 明知的观点 ～ clothes 实用的衣服 sensitive: quick to receive 敏感的 a ～ skin ～ paper 感光纸