1.compulsory a．強制性的(mandatory）；義務的(required)

詞根記憶：com(一起)+ puls（推，沖）+ory--起推--強制性的

例:compulsory military conscription強制征兵//compulsory education義務教育

同根詞：repulse(v.反擊)；repulsive(a．排斥的)；compulsive(a．強制的)

2.computation n.計算，估計(calculation）

詞根記憶：com+put(思考，估計)+ation--計算，估計

例:The decorator did a few computations to determine how much wallpaper was needed.

3.compute v.計算(to determine or calculate by means of a computer);估算(to determine especially by mathematical means)；推斷(to reckon)

詞根記憶：computer(n.電腦)的動詞形式

例:This tax, which was assessed on villages, was computed by the central government using the annual census figures.

派生詞：computation(n.估計;計算)

4.conceal v.隱瞞;隱藏(to hide)

詞根記憶：con(一起)+ ceal(隱藏)--隱瞞；隱藏

例:Slips of the tongue do not necessarily reveal concealed beliefs or intentions.

5.concede v.讓步(to yield);（不情愿地）承認(to acknowledge grudgingly or hesitantly)

詞根記憶：con+cede(割讓)一讓出去--讓步

例:The lawyer conceded that his argument was not logical.

6.conceive v.懷孕(to become pregnant)；構思，設想(to think)

例:The ancients concawed the world as flat.

派生詞：conceivably( ad.今人信服的)：preconceived(a．預想的)

同根詞：perceive(v.知覺)；receive(v.收到)

7.concentrate v.聚集，濃魯營to bring into one main body)

詞根記憶：con(加強)+centr(中心)+ate--聚集在一個中心一聚集

例:We should discontinue the deluxe air filter and concentrate all our advertising efforts on the economy fitter.

派生詞：concentration(n．集中；濃度)

同根詞：central(a．中心的)

8.concentration n．專心，專注(the act or process of concentrating)；集中(a concentrated mass or thing);濃度(the amount of a component in a given area or volume)

詞根記憶：來自concentrate(v.讓集中;全神貫注; n.濃縮)

例:The salt concentration soon returns to normal.

同根詞：concentric(a．同心的；集中的)

9.conceptual a．觀念的，概念的(of, relating to, or consisting of concepts)

詞根記憶：來自concept(n.觀念，概念)

例:conceptual model概念模型

10.concern v.涉及，關系到(to relate to);使擔心(to be a care, trouble, or distress to)；n.關心( matter for consideration)

例:Clearly, the customer's main concem is the convenience afforded by one-stop shopping.

派生詞：concerned(a．有關的；關心的)