n(1)圆面(圈)((flat round area enclosed by a) curved line that has all of its points at the same distance from the centre)[C]：πr² is the area of a～.πr² 是圆的面积。draw a～画一个圆(圈);〖同〗ring;

(2)圆形物，环(anything like this shape)[C]：a～of mountains/trees/stones/spectators/dancers/haze环状山脉/一圈树/一圈石头/一圈旁观者/一圈跳舞的人/一团雾气;be surrounded by a～of admirers被许多崇拜者所包围;sit in a～坐成圆圈;〖同〗ring，circuit;

(3)包厢座(group of seats in curved and banked rows on a balcony in a theatre，cinema，concert-hall，etc)[C]：(= AmE balcony)：book seats (sit) in the upper/dress～预定(坐在)上面/前排包厢的座位;The only seats left are in the～.只有包厢中才有空座。

(4)圈子;……界(group of people connected in a formal way sharing common interests，activities，profession，etc)[C]：widen one's～of acquaintances 扩大交往圈子;have a large(small)～of acquaintance in political/military/parliamentary～s 在政治/军事/议会界交往很广(少);have a large(small)～of friends in scientific/theatrical/business～s 在科学/戏剧/企业界朋友很多(少);in wealthy ～s 在有钱人中;one's～of interests某人的兴趣范围;〖同〗group，set，society，sphere，compass;

(5)循环，周期(chain of events which finishes where it began;cycle)[C]：the～of the seasons/the year 四季/一年的循环;〖同〗cycle，round，revolution;

→′circlet n 小圈(环);′circulate v 循环;͵circu′lation n 循环;′circular adj;

v(1)画(形成)圆圈(draw or make a circle around (sth))[T+n]：～the correct answer/the mistakes with a red pencil用红铅笔圈出正确的答案/错误;Please～the word which you think is wrong.请把你认为错的词圈出来。(fence)～the yard(篱笆)圈着院子;(enemy)～the village(敌人)围住村子;(hills)～the town(群山)环抱着镇子;〖同〗encircle，surround，enclose;

(2)(围绕……)转圈子(运转，盘旋)(move or travel in a circle or circled somewhere or round sth)[T+n，I，I+adv(about/(a)round)+prep(over)，I+adv(about/(a)round)，I+prep(over)]：(plane)be～ing the airport(飞机)在绕机场飞行;(bird)be～ing the tree(鸟)在绕树飞;(dancer)be～ing the floor(跳舞者)在绕场地跳舞;(moon)～the earth(月球)绕地球运转;(spacecraft)～the moon(宇宙飞船)绕月球运转;(ship)～the iceberg(船)绕过冰山;(helicopter/vulture/hawk)be～ing ((a)round) over their heads (直升飞机/秃鹫/鹰)在他们头顶上盘旋;(plane/bird)～in the sky/overhead(飞机/鸟)在空中/头顶上盘旋;

【辨异】circle与turn、revolve、rotate、spin、whirl和roll都有“旋转”的意思。turn((使)旋转)是通常用词，指围绕轴心或(固定的)中心(物体)旋转，如：A gate turns on its hinges.(大门靠折页转动。)revolve((使)旋转)是反复作圆周运动，尤指沿一轨道围绕一中心旋转，有时也指一物体围绕自己的轴心或一中心旋转，如：The moon revolves about the earth.(月亮围绕地球运行。)rotate((使)旋转)也是反复地作圆周运动，但仅指一物体围绕自己的轴心或一中心旋转(此时可与revolve换用)，如：The earth rotates on its axis.(地球绕轴心旋转。)spin((使)迅速旋转)指快速持续地旋转(通常是在一小范围内)，如：A top spins.(陀螺迅速旋转。)whirl((使)快速旋转)指快速、持续地revolve或rotate，如：the whirling blades of a helicopter(直升飞机飞速旋转的桨叶);circle(盘旋)指任何形式的圆周运动(包括围绕某物的旋转)，如：A hawk was circling overhead.(一头鹰在头上盘旋。)roll((使)滚动)指曲线形物体(如轮子)在一表面上的转动，如：A ball rolled down the road.(一个球沿路滚下去。)