4周搞定2000+托福核心词
reliance = re(再) + li(捆绑，联合) + ance(表名词) = 自恃
irrevocable = ir(不) + re(再) + voc(叫喊) + able(能…的) = 不可以再叫喊的→不可取消的
occur = oc(来) + cur(跑) = 某个方向跑→发生
concur = con(共同) + cur(跑) = 共同跑到→意见一致
再跑→再次发生→重现
recur
常考释义
vi. 复发；重现；采用；再来；循环；递归
Once the drugs are stopped, however, symptoms typically recur.
但是一旦停止用药，症状就会复发。
The possibility that mass extinctions may recur periodically has given rise to such hypotheses as that of a companion star with a long-period orbit deflecting other bodies from their normal orbits, making some of them fall to Earth as meteors and causing widespread devastation upon impact.
对于周期性出现大规模物种灭绝的可能性，引发了这样的假设：一颗具有长周期轨道的伴星体使其他天体从正常轨道偏离，导致其中一些天体变成流星掉落到地球，撞击时造成大范围破坏。
来源于：阅读OFFICIAL15 P2American paleontologists David Raup and John Sepkoski, who have studied extinction rates in a number of fossil groups, suggest that episodes of increased extinction have recurred periodically, approximately every 26 million years since the mid-Cretaceous period.
美国古生物学家David Raup和John Sepkoski曾经从大量化石群中研究物种灭绝的比率。他们指出，自从白垩纪时期中期以来，灭绝的物种不断增多，大约每隔两千六百万年就会定期发生一次。
来源于：阅读OFFICIAL15 P2以上图片仅供学习交流使用，版权归原作者所有，如有侵权，请与我方联系
