1.compulsory a．强制性的(mandatory）；义务的(required)

词根记忆：com(一起)+ puls（推，冲）+ory--起推--强制性的

例:compulsory military conscription强制征兵//compulsory education义务教育

同根词：repulse(v.反击)；repulsive(a．排斥的)；compulsive(a．强制的)

2.computation n.计算，估计(calculation）

词根记忆：com+put(思考，估计)+ation--计算，估计

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

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

词根记忆：computer(n.电脑)的动词形式

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

派生词：computation(n.估计;计算)

4.conceal v.隐瞒;隐藏(to hide)

词根记忆：con(一起)+ ceal(隐藏)--隐瞒；隐藏

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

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

词根记忆：con+cede(割让)一让出去--让步

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

6.conceive v.怀孕(to become pregnant)；构思，设想(to think)

例:The ancients concawed the world as flat.

派生词：conceivably( ad.今人信服的)：preconceived(a．预想的)

同根词：perceive(v.知觉)；receive(v.收到)

7.concentrate v.聚集，浓鲁营to bring into one main body)

词根记忆：con(加强)+centr(中心)+ate--聚集在一个中心一聚集

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

派生词：concentration(n．集中；浓度)

同根词：central(a．中心的)

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

词根记忆：来自concentrate(v.让集中;全神贯注; n.浓缩)

例:The salt concentration soon returns to normal.

同根词：concentric(a．同心的；集中的)

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

词根记忆：来自concept(n.观念，概念)

例:conceptual model概念模型

10.concern v.涉及，关系到(to relate to);使担心(to be a care, trouble, or distress to)；n.关心( matter for consideration)

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

派生词：concerned(a．有关的；关心的)