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1.reef n．礁，暗礁(ridge of rock, shingle, sand, etc. at or near the surface of the sea)
例：coral reef珊瑚礁
2.referendum n.[pl. referenda]公民投票(referring of a political issue to a general vote by all the people of a country for a decision)
3.referral n．推薦，提及(the act, action, or an instance of referring)
例：Some business is difficult to obtain through referrals and word-of- mouth.
4.refine v.精煉(to free from impurities)；改善(to improve)
詞根記憶：re(重新)+fine(純的，精美的)--重新變純--精煉
例：The oil needed to be refined before it could be used. //The company refined its hiring process.
派生詞：refinement(n．提煉；改進)；refined(a．精煉的)
5.refiner n．精煉機(machines which make improvement by introducing subtleties or distinctions)；精制者，精煉者
詞根記憶：來自refine(v.精煉；改善)
例：Heating-oil prices are expected to be higher this year than last because refiners are paying about $5 a barrel more for crude oil than they were last year.
6.refinery n.精煉廠(a building and equipment for refining or processing)
詞根記憶：來自refine(v.精煉；改善)
例：The Tasberg refinery is more favorably situated than the Grenville refinery with respect to the major supply routes for raw petroleum.
同根詞：refinement(n．精制：提純)
7.reflective a．反射的，反照的(capable of reflecting light, images, or sound waves)；深思熟慮的(thoughtful)
詞根記憶：re+flect(彎曲)+ive(形容詞后綴)--向后彎曲的--反射的
例：Antarctica receives more solar radiation than does any other place on Earth, yet the temperatures are so cold and the ice cap is so reflective that little of the polar ice melts during the summer.
派生詞：reflectively( ad.廈應地：反照地)
8.reflex n.（對刺激的本能）反應(an automatic and often inborn response to a stimulus)；[~es]反應能力(the power of acting or responding with adequate speed)
詞根記憶：re(反)+flex(彎曲)--反過來彎曲--反應
例：Fifteen-year-olds typically have much better eyesight, much better hand-eye coordination and much quicker reflexes.
派生詞：reflexive(a．自發的：反身的)
9.refraction n.折射(bending of a ray of light)
詞根記憶：來自refract(v.使折射)
例：The Chinese launched weather balloons near their theodolites to measure atmospheric temperature and pressure changes to better estimate refraction errors.
派生詞：refractive(a.折射的)
10.refrain v.抑制，避免(curb, restrain)
例：People must refrain from drinking if they will have to drive.
11.refuel v．補給燃料(to provide with additional fuel)；重新得到燃料(to take on additional fuel)
詞根記憶：re（再）+fuel(燃料)--重新得到燃料
例：The Skybus's fuel efficiency results in both lower fuel costs and reduced time spent refueling.
adj. 精煉的，優雅的，精細的 v. 精煉，凈化，使
