Unit 4 Sharing 核心词汇课件-2024-2025学年高中英语人教版（2019）选择性必修第四册

-circ-,-cycl- *ker-, Proto-Indo-European root meaning "to turn, bend." Objectives: Understand and memorize the core words such as circle, semicircle, circus, circulate,circuit, circumvent, circumspect. Key Points: circle, circus, circuit Difficult points: Apply the new words to language application 1.circle/ ˈsɜːk(ə)l / v.画圈，环绕 n.圈,环 2.circular/ ˈsɜːkjələ(r) / a. 3.encircle/ ɪnˈsɜːkl / v. 4.semicircle/ ˈsemisɜːk(ə)l / n.半圆 5.semicircular/ ˌsemiˈsɜːkjələ(r) / a.半圆的 6.circus/ ˈsɜːkəs / n.马戏团 7.circulate/ ˈsɜːkjəleɪt/ v.环流，循环，流转 circulation/ ˌsɜːkjəˈleɪʃ(ə)n / n. 循环，发行量 circulatory/ ˌsɜːkjəˈleɪtəri / a. relating to the circulation of blood in the body. (血液)循环的 ...the human circulatory system. ...人类的血液循环系统。 8.circumference/ səˈkʌmfərəns / n.圆周，外围 circumferential / səˌkʌmfəˈrenʃəl / a. 9.circuit n. circuitry/ ˈsɜːkɪtri / n.电路系统，电路学 circuitous/ səˈkjuːɪtəs / a. 迂回的 10. circumvent/ ˌsɜːkəmˈvent / v. find a way around (an obstacle): circumvention/ ˌsɜːkəmˈvenʃn / n. 11. circumcise/ ˈsɜːkəmsaɪz / v.环切 circumcision/ ˌsɜːkəmˈsɪʒn / n. 12. circumstance/ ˈsɜːkəmstəns / n. -circ-圆圈，环绕-stanc-,stand 站一圈，外面，环境 circumstantial/ ˌsɜːkəmˈstænʃ(ə)l / 依照情况的；详细的，详尽的 circumstantially ad.依照情况地 13.circumnavigate / ˌsɜːkəmˈnævɪɡeɪt / v. circumnavigation/ˌsɜːkəmˌnævɪˈɡeɪʃn/ 世界一周旅行；周游世界 circumnavigator/ˌsɜːkəmˈnævɪˌɡeɪtə(r)/ 世界一周旅行者；周游世界者 14.cycle / ˈsaɪk(ə)l /n. v.圈，环 15.bicycle n.两个轮子，自行车 16.tricycle n.三个轮子，三轮车 17.cycling n. 骑行 18.cyclist n.骑自行车的人 19.cyclical/ ˈsaɪklɪk(ə)l / a.循环的 20.cyclic/ ˈsaɪklɪk / a. 循环的 the four cyclists 21.recycle/ ˌriːˈsaɪkl / v. re-back，回+cycle环，回收利用，再循环 22.recycling n. 23.recyclable/ ˌriːˈsaɪkləbl /a. recycle + –able 23.cyclone/ ˈsaɪkloʊn / n.气旋，龙卷风 24.anticyclone/ ˌæntiˈsaɪkləʊn /n.反气旋,高气压 24. encyclopedia / ɪnˌsaɪkləˈpiːdiə /n. from enkyklios "circular," also "general" (from en "in;" see in + kyklos "circle;" from PIE root *kwel- (1) "revolve, move round") + paideia "education, child-rearing," from pais (genitive paidos) "child" (see pedo-). 25.encyclopedic/ ɪnˌsaɪkləˈpiːdɪk / a. 知识渊博的; 百科全书般的 He had an encyclopedic knowledge of drugs.他有渊博的药品知识。 26.circa/ ˈsɜːkə / prep.ad.大约Circa is used in front of a particular year to say that this is the approximate date when something happened or was made. The story tells of a runaway slave girl in Louisiana, circa 1850. from Latin circa (adv., prep.) "around, round about, near; in the region of; about the time of," alternative form of circum "round about“. 27. circadian/ sɜːˈkeɪdiən / a.生理节奏的 coined 1959 by German-born biologist Franz Halberg, from Latin circa "about" (alternative form of circum "round about;" see circum-) + diem, accusative singular of dies "day" (from PIE root *dyeu- "to shine"). The original use is in circadian rhythm. 28.circum- around,on all sides环，周围的 from Latin adverb and preposition circum "around, round about," literally "in a circle," probably accusative form of circus "ring" (see circus). The Latin word was commonly used in word-formation. In French, the element became circon-; Kitchin points out that con for cum is common even in classical Latin. For sense development, compare German rings "around." 29.circumflex/ ˈsɜːkəmfleks / n.音调符号A circumflex or a circumflex accent is a symbol written over a vowel in French and other languages, usually to indicate that it should be pronounced longer than usual. It is used for example in the word "rôle." 加在元音上的音调符号; 法语和其它语言中常用，表示此音节在发声时应比平时更长"sign or mark placed over certain vowels to indicate accent or tone," 1570s, from Latin (accentus) circumflexus, "bent around," past participle of circumflectere "to bend around," of a charioteer, "turn around," from circum "around" (see circum-), + flectere "to bend" (see flexible). 30.circumscribe/ ˈsɜːkəmskraɪb / vt.约束，限定；在……上画圈；包围；（几何学）外接 late 14c., "to encompass; confine, restrain, mark out bounds or limits for," from Latin circumscribere "to make a circle around, encircle, draw a line around; limit, restrain, confine, set the boundaries of," from circum "around, round about" (see circum-) + scribere "to write" (from PIE root *skribh- "to cut"). Related: Circumscribed; circumscribing. describe v.往下画，描述 31.circumspect/ ˈsɜːkəmspekt /a.小心谨慎的，考虑周到的，慎重的 "cautious, wary/ ˈweri /," literally "looking about on all sides," early 15c., from Latin circumspectus "deliberate, guarded, well-considered," past participle of circumspicere "look around, take heed," from circum "around, round about" (see circum-) + specere "to look" (from PIE root *spek- "to observe"). Related: Circumspectly; circumspectness. 32.cirque/ sɜːk / n. 圆环；天然圆形剧场；盆地谷c. 1600, "a circus," from French cirque (14c.), from Latin circus.   练习： 1.The Daily News once had the highest ___________of any daily in the country. 2.If you come to an obstruction in a road you can seek to ______________ it. 3. Circus, the noun, is actually derived from a romanticized Greek works -ίρκος – which means _____or ring, and its history isn’t simple.  circle circulation circumvent 4. This circular path, which is always required to get electricity to flow and do something useful, is called a_________. 5. ___________ is the process of collecting and processing materials that would otherwise be thrown away as trash and turning them into new products. 6. It is important for a diplomat to behave in a manner that is both ___________and discreet. circuit Recycling circumspect 7. A 105-year-old _________ rides 14 miles in an hour en route to a world record. 8. A ________ is a large system of winds that rotates around a low-pressure centre, either in the Northern or Southern Hemisphere. 9.The weather is a ___________ to be taken into consideration. 10. How Magellan ___________ the globe？ circumnavigated cyclist cyclone circumstance $$