Anne coached Mary on her public speaking skills.安妮对玛丽的公共演讲技巧进行指导。

coarse adj.粗糙的

The sand was so coarse that it was quite painfial to walk on.这些沙子太粗糙了，走在上面脚很疼。

code n.代码，密码

The spy sent his message in a secret code.间谍用密码发送消息。

coil n.卷；线圈vt.盘绕，卷

A transformer is composed of two coils of wire placed together without wires actually in contact.变压器包括两个安装在一起的线圈，但电线之间实际上并未连接。

The snake coiled itself around the tree.蛇缠绕着树。

coin n.硬币

Bill’s pocket was flill of coins.比尔的口袋里装满广硬币。

The advertising company coined a new word to name the new product.那家广告公司创造出一个新词来为新产品命名。

collapse n.倒塌；崩溃，失败

The collapse of the stock market in 1929 signaled the beginning of the Depression.1929年股市崩盘，标志着经济大萧条的开始。

collision n.碰撞；冲突，抵触

There has been a collision involving a number of cars on the main road into town.在进城的主路上，有多辆汽车发生了碰撞。

colony n.①殖民地②群体

Australia and New Zealand are former British colonies.澳大利亚与新西兰曾是英国的殖民地。

A colony of ants lives under our driveway. 一群蚂蚁住在我们的私家车道下面。

combat n.战斗，格斗

There was fierce combat between the two sides.双方爆发了激烈的冲突。

combine v.联合，结合

Mary's and Bob's businesses combined to form a new company.玛丽的公司与鲍勃的公司合并成了一家新公司。