1.circulate v.散布，传播(to cause to become widespread)

词根记忆：circ(圆)+ul+ate(做)--绕圈走--散布，传播

例:The proposal to amend the bylaws of an organization was circtAated to its members for comment.

派生词：circulation(n．循环：传播)

2.circulation n.循环，流通(the process of going round continuously)；发行额(the average number of copies of a publication sold over a given period)

词根记忆：来自circulate(让循环，流通i散布)

例:The circulation of the poetry was confined to young Quaker women.

同根词：circus(n.圆形广场；马戏团)

3.circulatory a.循环的(of or relating to circulation or the circulatory system)

词根记忆：来自circular(a．圆形的；循环的)

例:A peculiar feature of the embryonic mammalian circulatory system is that in the area of the heart the cells adhere to one another, beating in unison and adopting specialized orientations exclusive of one another.

同根词：circulative(a．循环性的；促进循环的)

4.circumference n.圆周;圆周长(the perimeter of a circle)

词根记忆：circum(环绕)+fer(带来)+ence--带来一圈--圆周长

例:There are cogs around the circumference of a wheel.

同根词：circumspect(a.仔细的)；circumstance(n.环境)； circumstantial（a.不重要的）

5.circumspect a．谨慎的(cautious)

词根记忆：circum(环绕)+spect(看)--绕着看--谨慎的

例:The investor was circumspect when making predictions about the economy.

6.circumstance n.环境;事件(a condition, fact, or event)

词根记忆：circum(周围)+stance(站)一周围的存在一环境

例:The first is a circumstance for which the astronomer seeks to provide an explanation.

同根词：circumfluence(n.环流)

7.circumvent v.环绕(to make a circuit around)；回避，规避(to manage to get around)

词根记忆：circum(环绕)+vent(来)--绕着圈儿来规避--规避

同Immigrants could circumvent such exclusionary laws by leasing or purchasing land in their American-born children's names.

派生词：circumvention(n.规避)

8.citywide a．全市的，全市性的(including or involving all parts of a city)

分拆记忆：city(城市)+wide(广泛的)--全市的

例:Yet the fact is that not only were more jobs created than were eliminated, but the average pay for these new jobs has been higher than the average pay for jobs citywide every year since Delmont took office.

9.civic a．城市的(municipal);公民的；平民的(of citizens or citizenship)

例:cwic symbols城市象征//ciwc virtues公民道德//civic education平民教育

10.civilization n.文明，文化(a relatively high level of cultural and technological deve-lopment)

词根记忆：来自civilize(v.使文明；使开化)

例:Confused by the many strata and substrata of ancient crvilizations overlying one another, Schliemann temporarily halted his excavations of the fabled city of llium, the ancient Troy.