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1.retard v.妨碍(to impede)；减速(to slow down)
词根记忆：re+tard(迟缓)--使迟缓--妨碍
例：By sucking sap from the young twigs of the hemlock tree, the woolly adelgid retards tree growth, causing needles to change color from deep green to grayish green and to drop prematurely.
派生词：retardation(n．阻滞；延迟)
2.retarded a．智力迟钝的：发展迟缓的(slow or limited in intellectual or emotional development or academic progress)
词根记忆：来自retard(v.延迟：阻止)
派生词：mentally retarded 智障，智力迟钝
3.retention n．保持，留住（preserving, retaining）
词根记忆：re(一再)+tent(拿住)+ion --再拿住--保持
例：Retention of these territories became a sacred national cause.
4.reticent a.缄默的(inclined to be silent or uncommunicative)
词根记忆：re(一再)+tic(=silent安静)+ent--再安静--缄默的
例：Investigators found the local witnesses were reticent and suspicious of strangers.
5.retrieve v．取回(to get and bring back);恢复(to regain)；检索(to find again or extract stored information)
词根记忆：re+trieve(=find找到)--重新找到--取回
例：Jane retrieved the document from the computer's memory.// retrieve one's spirits恢复精神
派生词：retrieval(n.取回)
6.revamp n.改造(to reconstruct)；修订，修改(to revise)
词根记忆：re(重新)+vamp(修补)--修订
例：The National Academy of Sciences(英国国家科学院)urged the nation to revamp computer security procedures.
7.reveal v.（神）启示：揭露(to make( sth. secret or hidden) publicly or generally known)；显示(to open up to view)
联想记忆：re(反)+veal(看作veil面纱)--除去面纱--揭露
例：Excavations in East Africa reveal a tenth-century change in architectural style to reflect North African patterns.
派生词：revealing(a．透漏真情的：有启迪作用的)
8.revenue n．收入(income)；税收(the total annual income of the State from taxes)
联想记忆：re(回)+ven(来)+ue--回来的东西--收入
派生词：tax revenue税收
同根词：revenant(n．归来之人)
9.reverence v.尊敬，崇敬(honor or respect felt or shown)
词根记忆：来自revere(v.尊崇，尊敬)
例：The pilgrims showed reverence to God by praying.
vt. 妨碍，阻止
