1.coaster n．杯墊(a small mat that is put underneath a glass or cup to protect the surface of a table)：（供娛樂用的）滑坡鐵路

詞根記憶：來自coast(n.海岸)

例:roller coaster過山車

2.cocaine n.可卡因(drug used as a local anaesthetic by doctors, and as a stimulant by drug addicts)

詞根記憶：coca(古柯)+ine--可卡因

例:Thus enforcement efforts have ironically resulted in an observed increase in the illegal use of cocaine.

3.code n.法規(a body of law)；準則(a system of principles or rules)

例:the Education c6de教育法//code of ethics道德準則

4.codify v.整理（法律）（to classify）；系統化(to systematize)

詞根記憶：來白code(n.法規)

例:Jim Crow laws did not go as far in codifying traditional practice as they might have.

5.cognitive a．認知的(of, characterized by, involving, or relating to cognition)

詞根記憶：cogn(知道)+itive--知道的--認知的

派生詞:cognitive ability認知能力

6.coherent a．連貫的(consistent)；清楚的（having clarity or intelligibility）；附著的，黏在一起的(sticking together)

詞根記憶：co（-起）+her（黏著，黏附）+ent--附著的

例:The bacteria indeed form a large coherent group.

派生詞:cohesive(a．黏著的)；coherence(n.一致)

7.coinage n.貨幣，貨幣制度(system of coins in use)

詞根記憶：coin（幣）+age(行為，結果)--貨幣

例:Debasement of the coinage had compensated for the loss.

8.coincide v.巧合(to concur)；-致，符合(to correspond)

詞根記憶：co(共同)+in+cide(切)一共同切分--一致，符合

例:The discovery of leavened bread(膨松面包)roughly coincided with the introduction of a wheat variety.

派生詞:coincidence(n.巧合之事)；coincident(a．巧合的)：coincidental(a.一致的)

9.collaborate v.協作(to work together)；勾結，通敵(to cooperate treasonably as with an enemy occupation force in one's county)

詞根記憶：col(一起)+labor(工作)+ate--起工作--協作

例:The prisoners collaborated to plan the escape.

派生詞:collaboration(n.合作；勾結)

10.collapse v./n.崩潰(to break down completely)；失敗(to fail completely)

詞根記憶：col( -起)+lapse(滑，落)--全部滑落--崩潰

例:The local sugar beet(糖用甜菜)industry collapsed in 1902.

同根詞：elapse(讓時間流逝)；lapse( v./n．失誤)：relapse(v.舊病復發)