1.collateral n.抵押品，擔保(property pledged by a borrower to protect the interests of the lender)

詞根記憶：col+later(邊)+al--需要一邊提供支持的--擔保

例:I have no collateraL so the bank probably won't give me a loan.

同根詞：bilateral(a．雙邊的)；equilataral(a．等邊的)

2.collective a．集體的（relating to a group or society as a whole)

例:Using our collective resources, we made a bid for the property.

派生詞:collectively( ad.全體地，共同地)

3.collide v.碰撞：抵觸(to clash)

例:Two planes collided in midair.

派生詞:collision(n．碰撞；沖突)

4.collinear a．在同一直線上的(passing through or lying on the same straight line)

詞根記憶：col(一起)+linear(直線的)--在同一直線上的

例:Three or more points Pl, P2, P3.…., are said to be collinear if they lie on a single straight line L.

5.colonize v.建立殖民地，拓殖(to establish a colony in an area)

詞根記憶：來自colony(n.殖民地)

例:An ancestral species might have adapted to exploit a particular ecological niche on one island and then traveled over water to colonize other islands.

派生詞:colonization(n.殖民；殖民化)

6.coloration n．著色法，槳色法( the method of dying)；顏色，色澤(color)

詞根記憶：來自color(n.顏色)

例:Studies of several animal species have shown that when choosing mates,females prefer males with brighter carotenoid-based coloration.

7.colossal a．巨大的，龐大的(enormous)

例:Buying computers for an entire company is a colossalexpense.

8.combat n.戰(zhàn)斗(war, conflict)；v.與…作戰(zhàn)；同…斗爭(to struggle against);a．戰(zhàn)斗的

詞根記憶：com+bat(打，戰(zhàn)斗)--戰(zhàn)斗

例:To combat this problem we must establish a board to censor certain movies．//the combat mortality rates戰(zhàn)斗死亡率

派生詞：combatant(n．參戰(zhàn)者，戰(zhàn)士)：combative(a．斗志旺盛的)

同根詞：baton(n.警棍)；acrobat(n.雜技演員)

9.combine v.聯(lián)合，結合(to join)

詞根記憶：com(共同)+bi(兩個)+ne--使兩個在一起--結合

例:Mexican American leaders combined ethnic with contemporary civic symbols.

派生詞：combined(a．組合的)；combination(b.組合，化合)

10.combustion n.燃燒(burning, catching fire)

詞根記憶：com+bust(燃燒)+ion--燃燒

例:The quick combustion of the dry forest was caused by the lack of rain.