評論
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1.retard v.妨礙(to impede)；減速(to slow down)
詞根記憶：re+tard(遲緩)--使遲緩--妨礙
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.
派生詞：retardation(n．阻滯；延遲)
2.retarded a．智力遲鈍的：發展遲緩的(slow or limited in intellectual or emotional development or academic progress)
詞根記憶：來自retard(v.延遲：阻止)
派生詞：mentally retarded 智障，智力遲鈍
3.retention n．保持，留住（preserving, retaining）
詞根記憶：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.緘默的(inclined to be silent or uncommunicative)
詞根記憶：re(一再)+tic(=silent安靜)+ent--再安靜--緘默的
例：Investigators found the local witnesses were reticent and suspicious of strangers.
5.retrieve v．取回(to get and bring back);恢復(to regain)；檢索(to find again or extract stored information)
詞根記憶：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恢復精神
派生詞：retrieval(n.取回)
6.revamp n.改造(to reconstruct)；修訂，修改(to revise)
詞根記憶：re(重新)+vamp(修補)--修訂
例：The National Academy of Sciences(英國國家科學院)urged the nation to revamp computer security procedures.
7.reveal v.（神）啟示：揭露(to make( sth. secret or hidden) publicly or generally known)；顯示(to open up to view)
聯想記憶：re(反)+veal(看作veil面紗)--除去面紗--揭露
例：Excavations in East Africa reveal a tenth-century change in architectural style to reflect North African patterns.
派生詞：revealing(a．透漏真情的：有啟迪作用的)
8.revenue n．收入(income)；稅收(the total annual income of the State from taxes)
聯想記憶：re(回)+ven(來)+ue--回來的東西--收入
派生詞：tax revenue稅收
同根詞：revenant(n．歸來之人)
9.reverence v.尊敬，崇敬(honor or respect felt or shown)
詞根記憶：來自revere(v.尊崇，尊敬)
例：The pilgrims showed reverence to God by praying.
vt. 妨礙，阻止
