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1.reversal n.逆轉(an act or the process of reversing)
詞根記憶：來自reverse(v.翻轉)
例：New theories propose that catastrophic impacts of asteroids and comets may have caused reversals in the Earth's magnetic field.
同根詞：reversely( ad.相對地；反對地)
2.reverse v.取消（to undo the effect of）；逆轉(to change to the contrary)；a．相反的(contrary)
詞根記憶：re（回）+verse(轉向)--回轉方向--相反的
例：Refraining from eating certain foods could help reverse blockage of coronary arteries（冠狀動脈）.//The Ocean Wildlife Campaign urged States to undertake a number of remedies to reverse a decline in the shark population.//reverse fault逆斷層
派生詞：reversal(n．顛倒，逆轉)；reversible(a.可反轉的，可逆的)
3.reversion n.返回（原狀，舊習慣）(an act of returning)；逆轉(an act of turning the opposite way)
詞根記憶：re（回）+vers(轉)+ion--轉回去--返回
例：In spite of continuing national trends toward increased consumption of specialty foods, agronomists in the Midwest foresee a gradual reversion to the raising of agricultural staples: feed corn and hard red wheat.
同根詞：inversion(n．倒置)
4.revert v．(to)恢復原狀( to come or go back, return)
詞根記憶：re(回)+vert(轉)--重新轉回去--恢復原狀
例：Without endless watering, these fields will quickly revert to desert.
5.rewse v．修訂；修改( to correct)
詞根記憶：re(重新)+vise(看)--重新再看--修訂，修改
例：Analysts revised their predictions.
派生詞：revision(n，修訂；修訂本)；revisionist(a．修正主義的；n．修正主義者)
6.revitalize v.（使）新生，（使）得到復興(to give new life or vigor to, revive)
詞根記憶：re(重新)+vital(有活力的)+ize--重新充滿活力--復活
The government made great efforts to revitalize this restored riverfront area.
同根詞：vitality(n．生命力;活力)；vital(a．生死攸關的；生命的)
7.revive v.（使）復蘇(to return to consciousness or life)；（使）恢復(to bring back)
詞根記憶：re(重新)+vive(生命)--重新獲得生命復蘇
例：The lifeguard revived the drowning man.//The construction of an oil pipeline across the lake's bottom might revive pollution.
派生詞：revival(n.復蘇：復興)
8.revolution n．革命(overturn)；旋轉(revolving or rotating esp. of one planet round another)
詞根記憶：re+volut(滾，卷)+ion--不斷向前席卷而來的--革命
例：The Industrial Revolution was marked by the use of new machines, new energy sources, and new basic materials.//This machine can make 300 revolutions per second.
例：revolutionary(a．革命的)；revolutionize(v.使變革)
9.revolutionarlry a．革命的(of, relating to, or constituting a revolution);革命性的(constituting or bringing about a major or fundamental change)
詞根記憶：來自revolution(n．革命)
例：The American labor movement has never embraced revolutionary ideologies calling for the ultimate transformation of the economic order.
同根詞：revolutionist(n．革命家)
n. 活力，生命力
