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1.rewind v.重绕：倒带(to wind again)
词根记忆：re(重新)+wind(缠绕)--重绕
例：It takes ten minutes to rewind the film.
2.rhetoric n．雄辩，辩才(eloquence)
词根记忆：来自Rhetor，古希腊的修辞学教师，演说家
例：Do you believe the empty rhetoric of politicians?
3.rheumatic a．风湿病引起的（affected with rheumatism）
例：rheumatic fever风湿热
派生词：rheumatoid[a．（患）风湿病的]
4.rhinoceros n．（缩写rhino）犀牛(mammals of Africa and Asia that have one or two I upright keratinous horns on the snout and thick gray to brown skin with little hair)
例：The Wildlife Protection Committee plans to protect selected rhinoceroses.
5.rib n．肋骨(any of the paired curved bony or partly cartilaginous rods that stiffen the walls of the body of most vertebrates and protect the viscera);【船】肋材( curved part of the structure of sth. resembling a rib)
注意：肋骨、脉和伞骨形状比较类似，可以类推肋条，支撑物
例：One of the football player's ribs was cracked when he fell.//The canoe with small ribs was about twenty feet long and two feet wide.
6.ridge n.山脊，岭(a range of hills or mountains)
联想记忆：桥梁(bridge)去掉b就是脊(ridge)
例：the South Atlantic Ridge南大西洋海脊
7.ridicule n./v.嘲笑，嘲弄(to make fun of)
词根记忆：rid(笑)+icule--嘲笑
例：The children ridiculed john because of his poor clothing.
派生词；ridiculous(a．荒唐的，可笑的)
同根词：deride(v.嘲弄)
8.rigid a．严格的(strictly observed)；死板的(deficient in or devoid of flexibility)
词根记忆：rig(硬，刚)+id--强硬的--严格的
例：Eusocial insect societies have rigid caste systems.//My rigid boss refused to break the company's rules.
派生词：rigidly( ad.坚硬地；严格地)
9.rigor n．（气候，条件等的）严酷(harshness)；严格(strictness)；严密(exactness)
词根记忆：rig(硬，刚)+or--严酷；严格
例：These soldiers are seasoned to the rigors of the climate.//the rigor of a scientific proof科学实证的严密
派生词：rigorous(a．严格的；严密的)：rigorously( ad.严格地；严密地)
n. 嘲笑，愚弄，笑柄 v. 嘲笑，嘲弄，愚弄
