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1.reversal n.逆转(an act or the process of reversing)
词根记忆：来自reverse(v.翻转)
例：New theories propose that catastrophic impacts of asteroids and comets may have caused reversals in the Earth's magnetic field.
同根词：reversely( ad.相对地；反对地)
2.reverse v.取消（to undo the effect of）；逆转(to change to the contrary)；a．相反的(contrary)
词根记忆：re（回）+verse(转向)--回转方向--相反的
例：Refraining from eating certain foods could help reverse blockage of coronary arteries（冠状动脉）.//The Ocean Wildlife Campaign urged States to undertake a number of remedies to reverse a decline in the shark population.//reverse fault逆断层
派生词：reversal(n．颠倒，逆转)；reversible(a.可反转的，可逆的)
3.reversion n.返回（原状，旧习惯）(an act of returning)；逆转(an act of turning the opposite way)
词根记忆：re（回）+vers(转)+ion--转回去--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.
同根词：inversion(n．倒置)
4.revert v．(to)恢复原状( to come or go back, return)
词根记忆：re(回)+vert(转)--重新转回去--恢复原状
例：Without endless watering, these fields will quickly revert to desert.
5.rewse v．修订；修改( to correct)
词根记忆：re(重新)+vise(看)--重新再看--修订，修改
例：Analysts revised their predictions.
派生词：revision(n，修订；修订本)；revisionist(a．修正主义的；n．修正主义者)
6.revitalize v.（使）新生，（使）得到复兴(to give new life or vigor to, revive)
词根记忆：re(重新)+vital(有活力的)+ize--重新充满活力--复活
The government made great efforts to revitalize this restored riverfront area.
同根词：vitality(n．生命力;活力)；vital(a．生死攸关的；生命的)
7.revive v.（使）复苏(to return to consciousness or life)；（使）恢复(to bring back)
词根记忆：re(重新)+vive(生命)--重新获得生命复苏
例：The lifeguard revived the drowning man.//The construction of an oil pipeline across the lake's bottom might revive pollution.
派生词：revival(n.复苏：复兴)
8.revolution n．革命(overturn)；旋转(revolving or rotating esp. of one planet round another)
词根记忆：re+volut(滚，卷)+ion--不断向前席卷而来的--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.使变革)
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)
词根记忆：来自revolution(n．革命)
例：The American labor movement has never embraced revolutionary ideologies calling for the ultimate transformation of the economic order.
同根词：revolutionist(n．革命家)
n. 活力，生命力
